UIView.h 分析

#import <Foundation/Foundation.h> 基础框架入口
#import <UIKit/UIResponder.h>触摸事件响应处理
#import <UIKit/UIInterface.h> 界面UIcolor, UIFont 定义 
#import <UIKit/UIKitDefines.h> 一些宏定义
#import <UIKit/UIAppearance.h> 外观代理
#import <UIKit/NSLayoutConstraint.h> 布局对象约束


typedef NS_ENUM(NSInteger, UIViewAnimationCurve) { //动画曲线
    UIViewAnimationCurveEaseInOut,         // slow at beginning and end 缓慢开始，中间加速，然后减速到结束
    UIViewAnimationCurveEaseIn,            // slow at beginning  缓慢开始，加速到结束
    UIViewAnimationCurveEaseOut,           // slow at end  加速开始，加速到结束
    UIViewAnimationCurveLinear  //正常速度
};


typedef NS_ENUM(NSInteger, UIViewContentMode) {
    UIViewContentModeScaleToFill,  缩放内容到合适比例大小
    UIViewContentModeScaleAspectFit,      // contents scaled to fit with fixed aspect. remainder is transparent 缩放内容到合适的大小，边界多余部分透明
    UIViewContentModeScaleAspectFill,     // contents scaled to fill with fixed aspect. some portion of content may be clipped.缩放内容填充到指定大小，边界多余的部分省略
    UIViewContentModeRedraw,              // redraw on bounds change (calls -setNeedsDisplay) 重绘视图边界
    UIViewContentModeCenter,              // contents remain same size. positioned adjusted.  视图保持等比缩放
    UIViewContentModeTop, 视图顶部对齐
    UIViewContentModeBottom, 视图底部对齐
    UIViewContentModeLeft, 视图左侧对齐
    UIViewContentModeRight, 视图右侧对齐
    UIViewContentModeTopLeft, 视图左上角对齐
    UIViewContentModeTopRight, 视图右上角对齐
    UIViewContentModeBottomLeft, 视图左下角对齐
    UIViewContentModeBottomRight, 视图右下角对齐
};


typedef NS_ENUM(NSInteger, UIViewAnimationTransition) {
    UIViewAnimationTransitionNone, 没有过渡
    UIViewAnimationTransitionFlipFromLeft,  翻转视图从左到右
    UIViewAnimationTransitionFlipFromRight, 翻转视图从右到左
    UIViewAnimationTransitionCurlUp, 从上卷动
    UIViewAnimationTransitionCurlDown, 从下卷动
};


typedef NS_OPTIONS(NSUInteger, UIViewAutoresizing) {
    UIViewAutoresizingNone                 = 0,  父视图变化，自己不变化
    UIViewAutoresizingFlexibleLeftMargin   = 1 << 0,  视图的左边界和父视图的宽度等比例变化
    UIViewAutoresizingFlexibleWidth        = 1 << 1,视图的宽度和父视图的宽度成比例变化
    UIViewAutoresizingFlexibleRightMargin  = 1 << 2, 视图的右边界和父视图的宽度等比例变化
    UIViewAutoresizingFlexibleTopMargin    = 1 << 3,  视图的上边界和父视图的高度成等比例变化
    UIViewAutoresizingFlexibleHeight       = 1 << 4,  视图的高度和父视图的高度成比例变化
    UIViewAutoresizingFlexibleBottomMargin = 1 << 5 视图的下边界和父视图的高度成等比例变化

};

+ (Class)layerClass;                        // default is [CALayer class]. Used when creating the underlying layer for the view. 绘图布局

- (id)initWithFrame:(CGRect)frame;          //  初始化视图布局

@property(nonatomic,getter=isUserInteractionEnabled) BOOL userInteractionEnabled;  // 确定是否接受用户事件
@property(nonatomic)                                 NSInteger tag;                // default is 0  标记视图对象
@property(nonatomic,readonly,retain)                 CALayer  *layer;              //  返回一个只读的视图层

@end

@interface UIView(UIViewGeometry)

@property(nonatomic) CGRect            frame;  描述view在其父view坐标系中的定位和大小


@property(nonatomic) CGRect            bounds;      // 描述view自身的本地坐标系统的定位和大小
@property(nonatomic) CGPoint           center;      //  描述view的frame属性的中心点
@property(nonatomic) CGAffineTransform transform;   // 描述view相对bounds的平移量
@property(nonatomic) CGFloat           contentScaleFactor NS_AVAILABLE_IOS(4_0); 改变视图比例，主要用于修改分辨率，来支持高，低分辨率转化绘图


@property(nonatomic,getter=isMultipleTouchEnabled) BOOL multipleTouchEnabled;   // default is NO 设置是否接受多点触摸。YES 是接受多点，NO 接受单点。
@property(nonatomic,getter=isExclusiveTouch) BOOL       exclusiveTouch;         // default is NO 当前视图独占触摸事件


- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event;   //   接收视图触摸事件，遍历视图，确定最终接受视图层
- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event;   //     判断触摸事件是否在当前视图


- (CGPoint)convertPoint:(CGPoint)point toView:(UIView *)view;  转化当前视图的坐标相对于另外一个视图的坐标
- (CGPoint)convertPoint:(CGPoint)point fromView:(UIView *)view; 转化另外视图坐标相对于当前视图的坐标
- (CGRect)convertRect:(CGRect)rect toView:(UIView *)view; 转化当前视图的矩形坐标相对于另外一个视图的矩形
- (CGRect)convertRect:(CGRect)rect fromView:(UIView *)view;转化另外视图的矩形坐标相对于当前视图矩形


@property(nonatomic) BOOL               autoresizesSubviews; //  判断是否接收边界的改变，YES：接收  NO：不接收
@property(nonatomic) UIViewAutoresizing autoresizingMask;    //   视图边界大小调整参数


- (CGSize)sizeThatFits:(CGSize)size;     // r 计算并返回一个最适应接收子视图的大小   
- (void)sizeToFit;                       //  移动并调整子视图的大小


@end

@interface UIView(UIViewHierarchy)

@property(nonatomic,readonly) UIView       *superview; 父视图
@property(nonatomic,readonly,copy) NSArray *subviews; 子视图
@property(nonatomic,readonly) UIWindow     *window; 窗口

- (void)removeFromSuperview;  将当前视图从父视图和窗口移除，并且把它的响应事件的响应链移除。
- (void)insertSubview:(UIView *)view atIndex:(NSInteger)index;   指定索引插入视图
- (void)exchangeSubviewAtIndex:(NSInteger)index1 withSubviewAtIndex:(NSInteger)index2; 指定索引交换子视图

视图的添加都是以栈的方式，即后进先出。
- (void)addSubview:(UIView *)view;  添加视图到最后- (void)insertSubview:(UIView *)view belowSubview:(UIView *)siblingSubview;添加视图到底层
- (void)insertSubview:(UIView *)view aboveSubview:(UIView *)siblingSubview; 添加视图到顶层

- (void)bringSubviewToFront:(UIView *)view; 将指定子视图推送到前台（顶层）
- (void)sendSubviewToBack:(UIView *)view;  将指定子视图推送到后台

- (void)didAddSubview:(UIView *)subview;通知某个子视图已经添加
- (void)willRemoveSubview:(UIView *)subview;通知视图某个子视图即将移除

- (void)willMoveToSuperview:(UIView *)newSuperview; 通知即将移动到新的父视图中
- (void)didMoveToSuperview;通知已经到新父视图
- (void)willMoveToWindow:(UIWindow *)newWindow; 通知即将已移动到新的窗口
- (void)didMoveToWindow; 通知已经移动新的窗口

- (BOOL)isDescendantOfView:(UIView *)view;  // returns YES for self. 判断一个视图是否在父视图层中
- (UIView *)viewWithTag:(NSInteger)tag;     // recursive search. includes self  获取标记的子视图

// Allows you to perform layout before the drawing cycle happens. -layoutIfNeeded forces layout early
- (void)setNeedsLayout;  标记为需要重新布局，异步调用layoutIfNeeded刷新布局，不立即刷新，但layoutSubviews一定会被调用
- (void)layoutIfNeeded;如果，有需要刷新的标记，立即调用layoutSubviews进行布局（如果没有标记，不会调用layoutSubviews）

- (void)layoutSubviews;    // override point. called by layoutIfNeeded automatically. As of iOS 6.0, when constraints-based layout is used the base implementation applies the constraints-based layout, otherwise it does nothing. 重新布局

@end

@interface UIView(UIViewAnimationWithBlocks)


+ (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion NS_AVAILABLE_IOS(4_0);  动画效果处理块


+ (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion NS_AVAILABLE_IOS(4_0); // delay = 0.0, options = 0  动画效果处理块，无延迟


+ (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations NS_AVAILABLE_IOS(4_0); // delay = 0.0, options = 0, completion = NULL  动画效果处理块。无延迟，简单版


+ (void)transitionWithView:(UIView *)view duration:(NSTimeInterval)duration options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion NS_AVAILABLE_IOS(4_0); 过渡动画处理块


+ (void)transitionFromView:(UIView *)fromView toView:(UIView *)toView duration:(NSTimeInterval)duration options:(UIViewAnimationOptions)options completion:(void (^)(BOOL finished))completion NS_AVAILABLE_IOS(4_0); // toView added to fromView.superview, fromView removed from its superview 视图之间切换过渡动画处理块


@end

@interface UIView(UIViewAnimationWithBlocks)


+ (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion NS_AVAILABLE_IOS(4_0);  动画效果处理块


+ (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion NS_AVAILABLE_IOS(4_0); // delay = 0.0, options = 0  动画效果处理块，无延迟


+ (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations NS_AVAILABLE_IOS(4_0); // delay = 0.0, options = 0, completion = NULL  动画效果处理块。无延迟，简单版


+ (void)transitionWithView:(UIView *)view duration:(NSTimeInterval)duration options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion NS_AVAILABLE_IOS(4_0); 过渡动画处理块


+ (void)transitionFromView:(UIView *)fromView toView:(UIView *)toView duration:(NSTimeInterval)duration options:(UIViewAnimationOptions)options completion:(void (^)(BOOL finished))completion NS_AVAILABLE_IOS(4_0); // toView added to fromView.superview, fromView removed from its superview 视图之间切换过渡动画处理块


@end@interface UIView(UIViewRendering)


- (void)drawRect:(CGRect)rect;  子类重写方法，重绘


- (void)setNeedsDisplay; 标记为需要重绘，异步调用drawRect
- (void)setNeedsDisplayInRect:(CGRect)rect; 标记为需要局部重绘


@property(nonatomic)                 BOOL              clipsToBounds;              // When YES, content and subviews are clipped to the bounds of the view. Default is NO. 决定子视图边界是否可以超过父视图范围
@property(nonatomic,copy)            UIColor          *backgroundColor;            // default is nil 背景颜色
@property(nonatomic)                 CGFloat           alpha;                      // animatable. default is 1.0 透明度， 取值范围为0.0 --- 1.0                
@property(nonatomic,getter=isOpaque) BOOL              opaque;                     // default is YES. opaque views must fill their entire bounds or the results are undefined. the active CGContext in drawRect: will not have been cleared and may have non-zeroed pixels    决定该消息接收者(UIView instance)是否让其视图不透明,用处在于给绘图系统提供一个性能优化开关。
@property(nonatomic)                 BOOL              clearsContextBeforeDrawing; // default is YES. ignored for opaque views. for non-opaque views causes the active CGContext in drawRect: to be pre-filled with transparent pixels     决定绘制前是否清屏，默认为YES
@property(nonatomic,getter=isHidden) BOOL              hidden;                     // default is NO. doesn't check superviews   视图是否隐藏，默认为NO(显示),YES为隐藏
@property(nonatomic)                 UIViewContentMode contentMode;                // default is UIViewContentModeScaleToFill 视图边界填充
@property(nonatomic)                 CGRect            contentStretch NS_DEPRECATED_IOS(3_0,6_0); // animatable. default is unit rectangle {{0,0} {1,1}}. Now deprecated: please use -[UIImage resizableImageWithCapInsets:] to achieve the same effect. 视图拉伸和缩略


@end