【UIKit-124-3】#import <UIKit/UIView.h>

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【视图渲染】

@interface UIView(UIViewRendering)

- (void)drawRect:(CGRect)rect;// 重绘

- (void)setNeedsDisplay;// 标记需要展示

- (void)setNeedsDisplayInRect:(CGRect)rect;// 展示

【裁剪】

@property(nonatomic) BOOL clipsToBounds; // 父视图，对于超出自身范围的子视图进行裁剪（默认NO）

- (void)viewDidLoad {    [super viewDidLoad];        redView = [[UIView alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];    redView.backgroundColor = [UIColor redColor];    [self.view addSubview:redView];        greenView = [[UIView alloc]initWithFrame:CGRectMake(50, 50, 100, 100)];    greenView.backgroundColor = [UIColor greenColor];    [redView addSubview:greenView];     }-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{    redView.clipsToBounds = YES;}

【一般属性】

@property(nonatomic,copy) UIColor *backgroundColor; // 背景

@property(nonatomic) CGFloat alpha; // 透明度

@property(nonatomic,getter=isOpaque)BOOL opaque; // 默认不透明，不计算透明时的重叠复杂计算。（只在drawRect中使用？）

@property(nonatomic) BOOL clearsContextBeforeDrawing; // 默认YES，绘制前，清空

@property(nonatomic,getter=isHidden)BOOL hidden; // 隐藏，包括子视图

【填充方式】

@property(nonatomic) UIViewContentMode contentMode; // 填充方式，一般是imgView

    UIImageView *imgView = [[UIImageView alloc]initWithFrame:CGRectMake(100, 300, 150, 150)];    imgView.image = [UIImage imageNamed:@"dadajie_chenjie"];    imgView.backgroundColor = [UIColor redColor];    [self.view addSubview:imgView];        imgView.contentMode = UIViewContentModeRedraw;        /*     typedef NS_ENUM(NSInteger, UIViewContentMode) {     UIViewContentModeScaleToFill,          imgView比例，填充图片     UIViewContentModeScaleAspectFit,       图片比例，填充imgView（不满处透明）     UIViewContentModeScaleAspectFill,      图片比例，填充imgView(不满处白色)     UIViewContentModeRedraw,               与第一个很像，（setNeedsDisplay？）          //下面的图片都是原来大小，对其方式与imgView比较     UIViewContentModeCenter,     UIViewContentModeTop,     UIViewContentModeBottom,     UIViewContentModeLeft,     UIViewContentModeRight,     UIViewContentModeTopLeft,     UIViewContentModeTopRight,     UIViewContentModeBottomLeft,     UIViewContentModeBottomRight,     };     */

【tintColor】

// 与系统有关的一些颜色的修改。待研究。

@property(nonatomic,retain) UIColor *tintColorNS_AVAILABLE_IOS(7_0);

@property(nonatomic)UIViewTintAdjustmentMode tintAdjustmentModeNS_AVAILABLE_IOS(7_0);

- (void)tintColorDidChangeNS_AVAILABLE_IOS(7_0);

typedef NS_ENUM(NSInteger, UIViewTintAdjustmentMode) {

UIViewTintAdjustmentModeAutomatic,

UIViewTintAdjustmentModeNormal,

UIViewTintAdjustmentModeDimmed,

};

@end

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