iOS Realization

转换对象
让 Category 支持添加属性与成员变量
获取图片
通过颜色创建图片
让 UILabel 具有 padding 效果
让 UITextField 具有 padding 效果
方便快捷获取调整视图坐标与大小
为视图添加边线
寻找视图的控制器
吐司框效果
徽标效果
统计并限制输入长度
禁用粘贴功能
判断键盘是否已经升起
GCD Timer
在 Storyboard Autolayout 模式下使用 UIScrollview
播放短暂的提示声音
设置textView或者label的行间距方法
截屏
手势在左右的边缘才触发
修改 UITabbar 高度
自定义 UITabbar 图片
UITableViewCell 高度计算

转换对象

@interface NSObject (Convert)

// 快速创建模型
- (instancetype)initWithProperties:(NSDictionary *)properties;

// 获取属性列表
- (NSMutableArray *)properties;
+ (NSMutableArray *)properties;

// 自身对象转为字典
- (NSDictionary *)convertToDictionary;

// 打印对象
- (NSMutableString *)toString;

@end

#import <objc/message.h>
#import <objc/runtime.h>

@implementation NSObject (Convert)

- (instancetype)initWithProperties:(NSDictionary *)properties {
    if (self = [self init]) {
        [properties enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
            if ([obj isKindOfClass:[NSNull class]]) {
                obj = @"";
            }
            if ([key isEqualToString:@"id"]) {
                key = @"ID";
            }
            [self setValue:obj forKey:key];
        }];
    }
    
    return self;
}

#pragma mark - runtime

- (NSMutableArray *)properties {
    NSMutableArray *propertyArray = [[NSMutableArray alloc] init];
    u_int count;
    objc_property_t *propertyList = class_copyPropertyList([self class], &count);
    for (int i = 0; i < count; i++) {
        const char *propertyName = property_getName(propertyList[i]);
        NSString *stringName = [NSString  stringWithCString:propertyName
                                                   encoding:NSUTF8StringEncoding];
        [propertyArray addObject:stringName];
    }
    
    free(propertyList);
    
    return propertyArray;
}

+ (NSMutableArray *)properties {
    NSMutableArray *propertyArray = [[NSMutableArray alloc] init];
    u_int count;
    objc_property_t *propertyList = class_copyPropertyList([self class], &count);
    for (int i = 0; i < count; i++) {
        const char *propertyName = property_getName(propertyList[i]);
        NSString *stringName = [NSString  stringWithCString:propertyName
                                                   encoding:NSUTF8StringEncoding];
        [propertyArray addObject:stringName];
    }
    
    free(propertyList);
    
    return propertyArray;
}

- (NSDictionary *)convertToDictionary {
    NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
    // 获取本类属性列表字符串数组
    NSMutableArray *propertyArray = [self properties];
    
    [propertyArray enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
        [dict setObject:[self valueForKey:obj] forKey:obj];
    }];
    
    return dict;
}

- (NSString *)toString {
    NSMutableString *desc = [[NSMutableString alloc] init];
    
    NSMutableArray *propertyArray = [self properties];
    [propertyArray enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
        NSString *string = [NSString stringWithFormat:@"%@ = %@, ", obj, [self valueForKey:obj]];
        [desc appendString:string];
    }];
    
    NSRange range = NSMakeRange([desc length] - 2, 1);
    [desc deleteCharactersInRange:range];
    
    return desc;
}

@end

让 Category 支持添加属性与成员变量

// NSObject+IndieBandName.h
@interface NSObject (IndieBandName)
@property (nonatomic, strong) NSString *indieBandName;
@end

// NSObject+IndieBandName.m    
#import "NSObject+Extension.h"
#import <objc/runtime.h>
static const void *IndieBandNameKey = &IndieBandNameKey;    
@implementation NSObject (IndieBandName)
@dynamic indieBandName;

- (NSString *)indieBandName {
    return objc_getAssociatedObject(self, IndieBandNameKey);
}

- (void)setIndieBandName:(NSString *)indieBandName{
    objc_setAssociatedObject(self, IndieBandNameKey, indieBandName,
OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

@end

获取图片

@interface UIImage (Fetch)

// 通过名字获取图片，不带后缀，png图片
+ (UIImage *)imageWithName:(NSString *)aName;

// 通过名字和后缀获取图片
+ (UIImage *)imageWithName:(NSString *)aName suffix:(NSString *)aSuffix;

// 通过带后缀名字获取图片
+ (UIImage *)imageWithNameHasSuffix:(NSString *)aNameHasSuffix;

@end

@implementation UIImage (Fetch)

+ (UIImage *)imageWithName:(NSString *)aName {
    return [self imageWithName:aName suffix:@"png"];
}

+ (UIImage *)imageWithName:(NSString *)aName suffix:(NSString *)aSuffix {
    return [UIImage imageWithContentsOfFile:
            [[NSBundle mainBundle]
             pathForResource:aName
             ofType:aSuffix]];
}

+ (UIImage *)imageWithNameHasSuffix:(NSString *)aNameHasSuffix {
    return [UIImage imageWithContentsOfFile:
            [[NSBundle mainBundle]
             pathForAuxiliaryExecutable:aNameHasSuffix]];
}

@end

通过颜色创建图片

@interface UIImage (Generate)
+ (UIImage *)imageWithColor:(UIColor *)aColor;
+ (UIImage *)imageWithColor:(UIColor *)aColor size:(CGSize)aSize;
@end

#import "UIImage+Generate.h"

@implementation UIImage (Generate)

+ (UIImage *)imageWithColor:(UIColor *)aColor {
    return [self imageWithColor:aColor size:CGSizeMake(1, 1)];
}

+ (UIImage *)imageWithColor:(UIColor *)aColor size:(CGSize)aSize {
    UIGraphicsBeginImageContext(aSize);
    CGContextRef context = UIGraphicsGetCurrentContext();
    
    CGContextSetFillColorWithColor(context, [aColor CGColor]);
    CGRect rect = CGRectMake(0, 0, aSize.width, aSize.height);
    CGContextFillRect(context, rect);
    
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return image;
}

@end

让 UILabel 具有 padding 效果

@interface PaddingLabel : UILabel
@property (nonatomic, assign) UIEdgeInsets edgeInsets;
@end

@implementation PaddingLabel

- (id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        self.edgeInsets = UIEdgeInsetsMake(0, 10, 0, 10);
    }
    return self;
}

- (void)drawTextInRect:(CGRect)rect {
    [super drawTextInRect:UIEdgeInsetsInsetRect(rect, self.edgeInsets)];
}

@end

让 UITextField 具有 padding 效果

#define kPaddingWidth 5
// 控制 placeHolder 的位置，左右缩 5
- (CGRect)textRectForBounds:(CGRect)bounds {
    return CGRectInset(bounds, kPaddingWidth , 0);
}

// 控制文本的位置，左右缩 5
- (CGRect)editingRectForBounds:(CGRect)bounds {
    return CGRectInset(bounds, kPaddingWidth , 0);
}

方便快捷获取调整视图坐标与大小

@interface UIView (Accessor)

- (void)setOrigin:(CGPoint)point;
- (CGPoint)origin;

- (void)setSize:(CGSize)size;
- (CGSize)size;

- (void)setMinX:(CGFloat)x;
- (CGFloat)minX;

- (void)setMidX:(CGFloat)x;
- (CGFloat)midX;

- (void)setMaxX:(CGFloat)x;
- (CGFloat)maxX;

- (void)setMinY:(CGFloat)y;
- (CGFloat)minY;

- (void)setMidY:(CGFloat)y;
- (CGFloat)midY;

- (void)setMaxY:(CGFloat)y;
- (CGFloat)maxY;

- (void)setWidth:(CGFloat)width;
- (CGFloat)width;

- (void)setHeight:(CGFloat)height;
- (CGFloat)height;

@end

@implementation UIView (Accessor)

- (void)setOrigin:(CGPoint)point {
    self.frame = CGRectMake(point.x, point.y, self.width, self.height);
}

- (CGPoint)origin {
    return self.frame.origin;
}

- (void)setSize:(CGSize)size {
    self.frame = CGRectMake(self.minX, self.minY, size.width, size.height);
}

- (CGSize)size {
    return self.frame.size;
}

- (void)setMinX:(CGFloat)x {
    self.frame = CGRectMake(x, self.minY, self.width, self.height);
}

- (CGFloat)minX {
    return self.frame.origin.x;
}

- (void)setMidX:(CGFloat)x {
    self.frame = CGRectMake(x - self.width / 2, self.minY, self.width, self.height);
}

- (CGFloat)midX {
    return CGRectGetMidX(self.frame);
}

- (void)setMaxX:(CGFloat)x {
    self.frame = CGRectMake(x - self.width, self.minY, self.width, self.height);
}

- (CGFloat)maxX {
    return self.minX + self.width;
}

- (void)setMinY:(CGFloat)y {
    self.frame = CGRectMake(self.minX, y, self.width, self.height);
}

- (CGFloat)minY {
    return self.frame.origin.y;
}

- (void)setMidY:(CGFloat)y {
    self.frame = CGRectMake(self.minX, y - self.height / 2, self.width, self.height);
}

- (CGFloat)midY {
    return CGRectGetMidY(self.frame);
}

- (void)setMaxY:(CGFloat)y {
    self.frame = CGRectMake(self.minX, y - self.height, self.width, self.height);
}

- (CGFloat)maxY {
    return self.minY + self.height;
}

- (void)setWidth:(CGFloat)width {
    self.frame = CGRectMake(self.minX, self.minY, width, self.height);
}

- (CGFloat)width {
    return CGRectGetWidth(self.bounds);
}

- (void)setHeight:(CGFloat)height {
    self.frame = CGRectMake(self.minX, self.minY, self.width, height);
}

- (CGFloat)height {
    return CGRectGetHeight(self.bounds);
}

@end

为视图添加边线

typedef enum {
    CHEdgeOrientationTop,
    CHEdgeOrientationLeft,
    CHEdgeOrientationBottom,
    CHEdgeOrientationRight
} CHEdgeOrientation;

@interface UIView (BorderLine)
- (void)setBorderLineColor:(UIColor *)aColor;
- (void)setBorderLineColor:(UIColor *)aColor edgeOrientation:(CHEdgeOrientation)orientation;
@end

@implementation UIView (BorderLine)

- (void)setBorderLineColor:(UIColor *)aColor {
    [self setBorderLineColor:aColor edgeOrientation:CHEdgeOrientationBottom];
    [self setBorderLineColor:aColor edgeOrientation:CHEdgeOrientationTop];
    [self setBorderLineColor:aColor edgeOrientation:CHEdgeOrientationLeft];
    [self setBorderLineColor:aColor edgeOrientation:CHEdgeOrientationRight];
}

- (void)setBorderLineColor:(UIColor *)aColor
           edgeOrientation:(CHEdgeOrientation)orientation {
    CALayer *line = [[CALayer alloc] init];
    line.backgroundColor = aColor.CGColor;
    
    CGRect lineFrame = CGRectZero;
    if (CHEdgeOrientationTop == orientation) {
        // 上边加线
        lineFrame = CGRectMake(CGRectGetMinX(self.bounds),
                               CGRectGetMinY(self.bounds),
                               CGRectGetWidth(self.bounds),
                               1);
    } else if (CHEdgeOrientationLeft == orientation) {
        // 左边加线
        lineFrame = CGRectMake(CGRectGetMinX(self.bounds),
                               CGRectGetMinY(self.bounds),
                               1,
                               CGRectGetHeight(self.bounds));
    } else if (CHEdgeOrientationBottom == orientation) {
        // 底边加线
        lineFrame = CGRectMake(CGRectGetMinX(self.bounds),
                               CGRectGetMaxY(self.bounds),
                               CGRectGetWidth(self.bounds),
                               1);
    } else {
        // 右边加线
        lineFrame = CGRectMake(CGRectGetMaxX(self.bounds),
                               CGRectGetMinY(self.bounds),
                               1,
                               CGRectGetHeight(self.bounds));
    }
    line.frame = lineFrame;
    [self.layer addSublayer:line];
}

@end

寻找视图的控制器

@interface UIView (FindUIViewController)
- (UIViewController *)viewController;
@end

@implementation UIView (FindUIViewController)

- (UIViewController *)viewController {
    /// Finds the view's view controller.
    // Traverse responder chain. Return first found view controller, which will be the view's view controller.
    UIResponder *responder = self;
    while ((responder = [responder nextResponder]))
        if ([responder isKindOfClass: [UIViewController class]])
            return (UIViewController *)responder;
    
    // If the view controller isn't found, return nil.
    return nil;
}

@end

吐司框效果

@interface UIView (Toast)
+ (void)toastMessage:(NSString *)theMessage;
@end

#import "PaddingLabel.h"
#define kDelayDuration 0.8
@implementation UIView (Toast)

// 提示信息，自动消失
+ (void)toastMessage:(NSString *)theMessage {
    UIFont *theFont = [UIFont preferredFontForTextStyle:UIFontTextStyleFootnote];
    CGSize boundingRectSize = CGSizeMake(CGRectGetWidth([[UIScreen mainScreen] bounds]) - 80, CGRectGetHeight([[UIScreen mainScreen] bounds]));
    CGSize size = [theMessage boundingRectWithSize:boundingRectSize
                                           options:NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesFontLeading | NSStringDrawingUsesLineFragmentOrigin
                                        attributes:@{NSFontAttributeName:theFont}
                                           context:nil].size;
    
    PaddingLabel *toastLabel = [[PaddingLabel alloc] init];
    toastLabel.bounds = CGRectMake(0, 0, size.width + 20, size.height + 20);
    CGRect bounds = [[UIScreen mainScreen] bounds];
    toastLabel.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.7];
    toastLabel.textColor = [UIColor whiteColor];
    toastLabel.textAlignment = NSTextAlignmentCenter;
    toastLabel.numberOfLines = 0;
    toastLabel.layer.cornerRadius = 5;
    toastLabel.layer.masksToBounds = YES;
    toastLabel.font = theFont;
    toastLabel.text = theMessage;
    
    // 实现可以让toast显示在键盘上方
    [[[[UIApplication sharedApplication] windows] lastObject] addSubview:toastLabel];
    
    toastLabel.center = CGPointMake(bounds.size.width / 2 , bounds.size.height * 2);
    [UIView animateWithDuration:0.5
                          delay:0
                        options:UIViewAnimationOptionCurveEaseInOut
                     animations:^{
                         toastLabel.center = CGPointMake(bounds.size.width / 2 ,
                                                         CGRectGetMaxY(toastLabel.superview.frame)
                                                         - 100 - CGRectGetHeight(toastLabel.bounds) / 2);
                     }
                     completion:^(BOOL finished) {
                         [UIView animateWithDuration:0.5
                                               delay:kDelayDuration
                                             options:UIViewAnimationOptionCurveEaseInOut
                                          animations:^{
                                              toastLabel.alpha = 0;
                                          }
                                          completion:^(BOOL finished) {
                                              [toastLabel removeFromSuperview];
                                          }];
                     }];
}

@end

徽标效果

@interface BadgeView : UIView

@property (nonatomic, assign) NSUInteger unreadNumber;

- (instancetype)initWithOrigin:(CGPoint)origin;
- (instancetype)initWithOrigin:(CGPoint)origin unreadNumber:(NSUInteger)unreadNumber;

@end

#import "UIView+Accessor.h"
#define RGBColor(r,g,b,a) [UIColor colorWithRed:(r)/255.0f green:(g)/255.0f blue:(b)/255.0f alpha:(a)]
#define CHFont [UIFont preferredFontForTextStyle:UIFontTextStyleFootnote]

@interface BadgeView ()
@property (nonatomic, strong) UILabel *badgeLabel;
@end

@implementation BadgeView

- (instancetype)initWithOrigin:(CGPoint)origin {
    return [self initWithFrame:CGRectMake(origin.x, origin.y, 0, 0)];
}

- (instancetype)initWithOrigin:(CGPoint)origin unreadNumber:(NSUInteger)unreadNumber {
    if (self = [self initWithOrigin:origin]) {
        [self setUnreadNumber:unreadNumber];
    }
    return self;
}

- (id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        self.backgroundColor = RGBColor(255, 65, 73, 1);
        _badgeLabel = [UILabel new];
        _badgeLabel.textColor = [UIColor whiteColor];
        _badgeLabel.backgroundColor = self.backgroundColor;
        _badgeLabel.font = CHFont;
        _badgeLabel.textAlignment = NSTextAlignmentCenter;
        self.layer.masksToBounds = YES;
    }
    return self;
}

- (void)setUnreadNumber:(NSUInteger)unreadNumber {
    _unreadNumber = unreadNumber;
    NSString *unreadStr = _unreadNumber > 99 ? [NSString stringWithFormat:@"99+"] : [NSString stringWithFormat:@"%d", _unreadNumber];
    self.width = [unreadStr boundingRectWithSize:CGSizeMake(MAXFLOAT, 20)
                                           options:NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesFontLeading | NSStringDrawingUsesLineFragmentOrigin
                                        attributes:@{NSFontAttributeName:CHFont}
                                           context:nil].size.width + 4;
    self.width = self.width < 20 ? 20 : self.width;
    self.height = 20.0f;
    if(unreadNumber > 0){
        [self setNeedsDisplay];
        self.hidden = NO;
    }else{
        self.hidden = YES;
    }
}

- (void)drawRect:(CGRect)rect {
    NSString *unreadStr = _unreadNumber > 99 ? [NSString stringWithFormat:@"99+"] : [NSString stringWithFormat:@"%d",_unreadNumber];
    _badgeLabel.text = unreadStr;
    self.layer.cornerRadius = self.width > self.height + 5 ? self.width / 3 : self.width / 2;
    [_badgeLabel drawTextInRect:self.bounds];
}

@end

统计并限制输入长度

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

@interface TextConfigure : NSObject

@property (nonatomic, weak) UILabel *countLabel;
@property (nonatomic, assign) NSUInteger maxLength;
// only text view use
@property (nonatomic, weak) UILabel *placeHolderLabel;

@end

@interface UITextView (TextConfigure)
@property (nonatomic, strong) TextConfigure *textConfigure;
@end

@interface UITextField (TextConfigure)
@property (nonatomic, strong) TextConfigure *textConfigure;
@end

#import <objc/runtime.h>

@interface TextConfigure ()

@property (nonatomic, assign) BOOL UITextViewTextDidChangeNotificationRegistered;
@property (nonatomic, assign) UITextView *observedTextView;

@property (nonatomic, assign) BOOL UITextFieldTextDidChangeNotificationRegistered;
@property (nonatomic, weak) UITextField *observedTextField;

@end

@implementation TextConfigure

- (void)dealloc {
    if (self.UITextFieldTextDidChangeNotificationRegistered) {
        [[NSNotificationCenter defaultCenter] removeObserver:self name:UITextFieldTextDidChangeNotification object:self.observedTextField];
    }
    if (self.UITextViewTextDidChangeNotificationRegistered) {
        [[NSNotificationCenter defaultCenter] removeObserver:self name:UITextViewTextDidChangeNotification object:self.observedTextView];
    }
}

- (instancetype)init
{
    self = [super init];
    if (self) {
        self.maxLength = 100;
        _countLabel.bounds = CGRectMake(0, 0, 30, 22);
    }
    return self;
}

- (void)setCountLabel:(UILabel *)countLabel {
    if (![_countLabel isEqual:countLabel]) {
        _countLabel = countLabel;
        _countLabel.textAlignment = NSTextAlignmentRight;
        _countLabel.bounds = CGRectMake(0, 0, 30, 22);
        _countLabel.textColor = [UIColor lightGrayColor];
        self.countLabel.text = [@(self.maxLength) stringValue];
    }
}

- (void)setMaxLength:(NSUInteger)maxLength {
    if (_maxLength != maxLength) {
        _maxLength = maxLength;
        self.countLabel.text = [@(self.maxLength) stringValue];
    }
}

- (void)setPlaceHolderLabel:(UILabel *)placeHolderLabel {
    if (![_placeHolderLabel isEqual:placeHolderLabel]) {
        _placeHolderLabel = placeHolderLabel;
        _placeHolderLabel.font = [UIFont preferredFontForTextStyle:UIFontTextStyleSubheadline];
        _placeHolderLabel.textColor = [UIColor lightGrayColor];
        _placeHolderLabel.text = _placeHolderLabel.text ? : [NSString stringWithFormat:@"请输入不多于%d字的内容", self.maxLength];
    }
}

- (void)initialNotificationForObject:(id)object {
    if ([object isKindOfClass:[UITextView class]]) {
        UITextView *textView = (UITextView *)object;
        [[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(textDidChange:)
                                                     name:UITextViewTextDidChangeNotification
                                                   object:textView];
        self.UITextViewTextDidChangeNotificationRegistered = YES;
        self.observedTextView = textView;
    } else if ([object isKindOfClass:[UITextField class]]) {
        UITextField *textField = (UITextField *)object;
        [[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(textDidChange:)
                                                     name:UITextFieldTextDidChangeNotification
                                                   object:textField];
        self.UITextFieldTextDidChangeNotificationRegistered = YES;
        self.observedTextField = textField;
    }
}

#pragma mark - text did change notification

- (void)textDidChange:(NSNotification *)notification {
    NSUInteger length = 0;
    id object = notification.object;
    if ([object isMemberOfClass:[UITextField class]]) {
        UITextField *textField = object;
        NSString *text = textField.text;
        if (text.length > self.maxLength && !textField.markedTextRange) {
            textField.text = [text substringToIndex:self.maxLength];
        }
        length = textField.text.length;
    } else if ([object isMemberOfClass:[UITextView class]]){
        UITextView *textView = object;
        NSString *text = textView.text;
        if (textView.text.length > self.maxLength && !textView.markedTextRange) {
            textView.text = [text substringToIndex:self.maxLength];
        }
        length = textView.text.length;
        if (length) {
            [self.placeHolderLabel setHidden:YES];
        } else {
            [self.placeHolderLabel setHidden:NO];
        }
    }
    
    _countLabel.text = [NSString stringWithFormat:@"%d", self.maxLength - length];
}

@end

#pragma mark - text field

static const void *UITextFieldKey = &UITextFieldKey;

@implementation UITextField (TextConfigure)

- (void)setTextConfigure:(TextConfigure *)textConfigure {
    [self willChangeValueForKey:@"UITextFieldKey"];
    objc_setAssociatedObject(self, UITextFieldKey, textConfigure, OBJC_ASSOCIATION_RETAIN);
    [self didChangeValueForKey:@"UITextFieldKey"];
    
    [textConfigure initialNotificationForObject:self];
}

- (TextConfigure *)textConfigure {
    return objc_getAssociatedObject(self, &UITextFieldKey);
}

@end

#pragma mark - text view

static const void *UITextViewKey = &UITextViewKey;

@implementation UITextView (TextConfigure)

- (void)setTextConfigure:(TextConfigure *)textConfigure {
    [self willChangeValueForKey:@"UITextViewKey"];
    objc_setAssociatedObject(self, UITextViewKey, textConfigure, OBJC_ASSOCIATION_RETAIN);
    [self didChangeValueForKey:@"UITextViewKey"];
    
    [textConfigure initialNotificationForObject:self];
}

- (TextConfigure *)textConfigure {
    return objc_getAssociatedObject(self, &UITextViewKey);
}

@end

禁用粘贴功能

覆盖以下方法：

- (BOOL)canPerformAction:(SEL)action withSender:(id)sender NS_AVAILABLE_IOS(3_0) {
    return NO;
}

判断键盘是否已经升起

- (BOOL)isKeyboardOnScreen {
    BOOL isKeyboardShown = NO;
    
    NSArray *windows = [UIApplication sharedApplication].windows;
    if (windows.count > 1) {
        NSArray *wSubviews =  [windows[1]  subviews];
        if (wSubviews.count) {
            CGRect keyboardFrame = [wSubviews[0] frame];
            CGRect screenFrame = [windows[1] frame];
            if (keyboardFrame.origin.y+keyboardFrame.size.height == screenFrame.size.height) {
                isKeyboardShown = YES;
            }
        }
    }
    
    return isKeyboardShown;
}

+(BOOL) isKeyBoardInDisplay {
    BOOL isExists = NO;
    for (UIWindow *keyboardWindow in [[UIApplication sharedApplication] windows])   {
        if ([[keyboardWindow description] hasPrefix:@"<UITextEffectsWindow"] == YES) {
            isExists = YES;
        }
    }
    
    return isExists;
}

GCD Timer

    __block int completeness = 0;
    dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
    dispatch_source_t timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue);
    dispatch_source_set_timer(timer, dispatch_walltime(NULL, 0), 0.3 * NSEC_PER_SEC / 18, 0);
    dispatch_source_set_event_handler(timer, ^{
        if (completeness != 100) {
            dispatch_async(dispatch_get_main_queue(), ^{
                [self.view updateDownloadingHUDProgress:completeness];
            });
            completeness++;
        } else {
            dispatch_source_cancel(timer);
        }
    });
    dispatch_source_set_cancel_handler(timer, ^{
//        dispatch_release(timer);
    });
    dispatch_resume(timer);

在 Storyboard Autolayout 模式下使用 UIScrollview

Setting UIViewControl 「Size Inspector」-「Simulated Size」「Freeform」「width: 320 height: 1000」
Drag a UIScrollview to this UIViewControl's view make sure it's frame is the same with UIViewControl's frame
Setting the UIScrollview's frame and contentSize on viewDidAppear:

播放短暂的提示声音

SystemSoundID soundID;
NSString *strSoundFile = [[NSBundle mainBundle] pathForResource:@"alertsound" ofType:@"wav"];
AudioServicesCreateSystemSoundID((__bridge CFURLRef)[NSURL fileURLWithPath:strSoundFile],&soundID;);
AudioServicesPlaySystemSound(soundID);

设置textView或者label的行间距方法

NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init];
paragraphStyle.lineSpacing = 4;
    
NSDictionary *attributes = @{ NSFontAttributeName:[UIFont systemFontOfSize:14], NSParagraphStyleAttributeName:paragraphStyle};
label.attributedText = [[NSAttributedString alloc]initWithString:label.text attributes:attributes];

截屏

- (UIImage *)screenshot:(UIDeviceOrientation)orientation isOpaque:(BOOL)isOpaque usePresentationLayer:(BOOL)usePresentationLayer {
     CGSize size;
 
     if (orientation == UIDeviceOrientationPortrait || orientation == UIDeviceOrientationPortraitUpsideDown) {
         size = CGSizeMake(self.view.frame.size.width, self.frame.size.height);
     } else {
         size = CGSizeMake(self.view.frame.size.height, self.frame.size.width);
     }
 
     UIGraphicsBeginImageContextWithOptions(size, isOpaque, 0.0);
 
     if (usePresentationLayer) {
         [self.view.layer.presentationLayer renderInContext:UIGraphicsGetCurrentContext()];
     } else {
         [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
     }
 
     UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
 
     UIGraphicsEndImageContext();
 
     return image;
 }
 
//使用方法：
UIImage *image = [self.view screenshot:UIDeviceOrientationPortrait
                               isOpaque:YES
                   usePresentationLayer:YES];

手势在左右的边缘才触发

UIScreenEdgePanGestureRecognizer *screenEdgePanGestureRecognizer = [[UIScreenEdgePanGestureRecognizer alloc] initWithTarget:self action:@selector(screenEdgePanGestureRecognizerHanlde:)];
screenEdgePanGestureRecognizer.edges = UIRectEdgeRight;
[self.view addGestureRecognizer:screenEdgePanGestureRecognizer];

修改 UITabbar 高度

继承 UITabBarController，重载以下方法

- (void)viewDidLayoutSubviews {
    [super viewDidLayoutSubviews];
    
    for (UIView *view in self.view.subviews) {
        if ([NSStringFromClass([view class]) isEqualToString:@"UITabBar"]) {
            view.frame = CGRectMake(0, 524, 320, 44);
            view.backgroundColor = [UIColor magentaColor];
        }
    }
}

使用 UIAppearance

[[UITabBar appearance] setFrame:CGRectMake(0, 524, 320, 44)];

自定义 UITabbar 图片

继承UITabBarController
调整UITabBar高度(optional)
定义自己的tabbar
将自定义的tabbar作为子视图添加到UITabbar上

UITableViewCell 高度计算

tableView:heightForRowAtIndexPath 方法会先于 tableView:cellForRowAtIndexPath 调用，所以我们在设置数据前不知道 cell 的高度，具体解决方法就是先计算一遍 cell 配置好数据后的高度. 不推荐直接调用 dataSource 的 tableView:cellForRowAtIndexPath 反法来获取到 cell，然后通过cell 获取到高度。

声明一个 cell 的属性 @property (nonatomic, strong) UITableViewCell *prototypeCell;
初始化UITableView 完成后，初始化该属性 ` self.prototypeCell = [self.tableView dequeueReusableCellWithIdentifier:kCellIdentifier];
在 tableView:heightForRowAtIndexPath 方法中给 self.prototypeCell 配置数据，计算高度，并返回。

TIPS: UITableView 是一次性计算完所有 Cell 的高度，如果有 1W 个 Cell，那么 tableView:heightForRowAtIndexPath 就会触发 1W 次，然后才显示内容。iOS7以后，提供了一个新方法可以避免这1W次调用，tableView:estimatedHeightForRowAtIndexPath 要求返回一个Cell 的估计值，实现了这个方法，那只有显示的 Cell 才会触发计算高度的 protocol.貌似在这里不管用，会影响刷新动画

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Realization.md

Realization.md

iOS Realization

转换对象

让 Category 支持添加属性与成员变量

获取图片

通过颜色创建图片

让 UILabel 具有 padding 效果

让 UITextField 具有 padding 效果

方便快捷获取调整视图坐标与大小

为视图添加边线

寻找视图的控制器

吐司框效果

徽标效果

统计并限制输入长度

禁用粘贴功能

判断键盘是否已经升起

GCD Timer

在 Storyboard Autolayout 模式下使用 UIScrollview

播放短暂的提示声音

设置textView或者label的行间距方法

截屏

手势在左右的边缘才触发

修改 UITabbar 高度

自定义 UITabbar 图片

UITableViewCell 高度计算

Files

Realization.md

Latest commit

History

Realization.md

File metadata and controls

iOS Realization

转换对象

让 Category 支持添加属性与成员变量

获取图片

通过颜色创建图片

让 UILabel 具有 padding 效果

让 UITextField 具有 padding 效果

方便快捷获取调整视图坐标与大小

为视图添加边线

寻找视图的控制器

吐司框效果

徽标效果

统计并限制输入长度

禁用粘贴功能

判断键盘是否已经升起

GCD Timer

在 Storyboard Autolayout 模式下使用 UIScrollview

播放短暂的提示声音

设置textView或者label的行间距方法

截屏

手势在左右的边缘才触发

修改 UITabbar 高度

自定义 UITabbar 图片

UITableViewCell 高度计算