UIView的常見屬性：@interface UIView : UIResponder<NSCoding, UIAppearance, UIAppearanceContainer, UIDynamicItem>/** *  通過一個frame來初始化一個UI控件 */- (id)initWithFrame:(CGRect)frame;// YES:能夠跟用戶進行交互@PRoperty(nonatomic,getter=isUserInteractionEnabled) BOOL userInteractionEnabled;  // default is YES// 控件的一個標記(父控件可以通過tag找到對應的子控件)@property(nonatomic)                                 NSInteger tag;                // default is 0// 圖層(可以用來設置圓角效果/陰影效果)@property(nonatomic,readonly,retain)                 CALayer  *layer;@end@interface UIView(UIViewGeometry)// 位置和尺寸(以父控件的左上角為坐標原點(0, 0))@property(nonatomic) CGRect            frame;// 位置和尺寸(以自己的左上角為坐標原點(0, 0))@property(nonatomic) CGRect            bounds;// 中點(以父控件的左上角為坐標原點(0, 0))@property(nonatomic) CGPoint           center;// 形變屬性(平移/縮放/旋轉)@property(nonatomic) CGAffineTransform transform;   // default is CGAffineTransformIdentity// YES:支持多點觸摸@property(nonatomic,getter=isMultipleTouchEnabled) BOOL multipleTouchEnabled;   // default is NO@end@interface UIView(UIViewHierarchy)// 父控件@property(nonatomic,readonly) UIView       *superview;// 子控件(新添加的控件默認都在subviews數組的后面, 新添加的控件默認都顯示在最上面/最頂部)@property(nonatomic,readonly,copy) NSArray *subviews;// 獲得當前控件所在的window@property(nonatomic,readonly) UIWindow     *window;// 從父控件中移除一個控件- (void)removeFromSuperview;// 添加一個子控件(可以將子控件插入到subviews數組中index這個位置)- (void)insertSubview:(UIView *)view atIndex:(NSInteger)index;// 交換subviews數組中所存放子控件的位置- (void)exchangeSubviewAtIndex:(NSInteger)index1 withSubviewAtIndex:(NSInteger)index2;// 添加一個子控件(新添加的控件默認都在subviews數組的后面, 新添加的控件默認都顯示在最上面/最頂部)- (void)addSubview:(UIView *)view;// 添加一個子控件view(被擋在siblingSubview的下面)- (void)insertSubview:(UIView *)view belowSubview:(UIView *)siblingSubview;// 添加一個子控件view(蓋在siblingSubview的上面)- (void)insertSubview:(UIView *)view aboveSubview:(UIView *)siblingSubview;// 將某個子控件拉到最上面(最頂部)來顯示- (void)bringSubviewToFront:(UIView *)view;// 將某個子控件拉到最下面(最底部)來顯示- (void)sendSubviewToBack:(UIView *)view;/**系統自動調用(留給子類去實現), 這些方法就可以叫做"事件方法", 由系統調用。**/- (void)didAddSubview:(UIView *)subview;- (void)willRemoveSubview:(UIView *)subview;- (void)willMoveToSuperview:(UIView *)newSuperview;- (void)didMoveToSuperview;- (void)willMoveToWindow:(UIWindow *)newWindow;- (void)didMoveToWindow;/**系統自動調用**/// 是不是view的子控件或者子控件的子控件(是否為view的后代)- (BOOL)isDescendantOfView:(UIView *)view;  // returns YES for self.// 通過tag獲得對應的子控件(也可以或者子控件的子控件)- (UIView *)viewWithTag:(NSInteger)tag;     // recursive search. includes self/**系統自動調用(留給子類去實現)**/// 控件的frame發生改變的時候就會調用,一般在這里重寫布局子控件的位置和尺寸// 重寫了這個寫方法后,一定調用[super layoutSubviews];- (void)layoutSubviews;@end@interface UIView(UIViewRendering)// YES : 超出控件邊框范圍的內容都剪掉@property(nonatomic)                 BOOL              clipsToBounds;// 背景色@property(nonatomic,copy)            UIColor          *backgroundColor; // default is nil// 透明度(0.0~1.0)@property(nonatomic)                 CGFloat           alpha;                      // default is 1.0// YES:不透明  NO:透明@property(nonatomic,getter=isOpaque) BOOL              opaque;                     // default is YES// YES : 隱藏  NO : 顯示@property(nonatomic,getter=isHidden) BOOL              hidden;// 內容模式@property(nonatomic)                 UIViewContentMode contentMode;                // default is UIViewContentModeScaleToFill@end@interface UIView(UIViewAnimationWithBlocks)+ (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion;+ (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion;+ (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations;+ (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay usingSpringWithDamping:(CGFloat)dampingRatio initialSpringVelocity:(CGFloat)velocity options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion;@end