UIView Class Reference
Initializing a View Object //初始化view
- (id)initWithFrame:(CGRect)aRect //通过一个矩形对象初始化
Configuring a View’s Visual Appearance //配置视觉展示
@property(nonatomic, copy) UIColor *backgroundColor //设置背景色
@property(nonatomic, getter=isHidden) BOOL hidden //隐藏view，默认为NO
@property(nonatomic) CGFloat alpha //设置透明度，0.0至1.0区间
@property(nonatomic, getter=isOpaque) BOOL opaque //告诉系统渲染器view是否不透明，设置YES可以加快渲染，默认为YES，如果设置了alpha值，应该设置为NO
@property(nonatomic) BOOL clipsToBounds //是否裁剪超出边界的视图，与css中overflow类似，默认为NO
@property(nonatomic) BOOL clearsContextBeforeDrawing //是否清除缓冲区中不可见内容，默认为YES，如果在一个滚动操作频繁的视图中，应该设为NO，以避免重新渲染，提升性能
+ (Class)layerClass //可以返回主layer所使用的类，UIView的子类可以通过重载这个方法，来让UIView使用不同的CALayer来显示
@property(nonatomic, readonly, retain) CALayer *layer //返回Core Animation层所使用的渲染方式
Configuring the Event-Related Behavior //配置事件关系
@property(nonatomic, getter=isUserInteractionEnabled) BOOL userInteractionEnabled //设置view是否响应用户事件，如touch、keyboard，默认为YES
@property(nonatomic, getter=isMultipleTouchEnabled) BOOL multipleTouchEnabled //设置view是否响应多点触摸，默认为NO
@property(nonatomic, getter=isExclusiveTouch) BOOL exclusiveTouch //设置touch是否排它，默认为NO
Configuring the Bounds and Frame Rectangles //配置边界和矩形框架
@property(nonatomic) CGRect frame //设置view框架
@property(nonatomic) CGRect bounds //设置view边界
@property(nonatomic) CGPoint center //设置中心点
@property(nonatomic) CGAffineTransform transform //设置transform，与css类似，CGAffineTransform是个矩阵结构体
Managing the View Hierarchy //管理视图层级
@property(nonatomic, readonly) UIView *superview //返回父view，只读
@property(nonatomic, readonly, copy) NSArray *subviews //返回子view集合，只读
@property(nonatomic, readonly) UIWindow *window //返回window对象，只读
- (void)addSubview:(UIView *)view //添加一个子view到view中
- (void)bringSubviewToFront:(UIView *)view //把一个子view位置移动到列表最前
- (void)sendSubviewToBack:(UIView *)view //把一个子view位置向后移动一格
- (void)removeFromSuperview //把调用该方法的view从其父view中移除
- (void)insertSubview:(UIView *)view atIndex:(NSInteger)index //插入一个子view到指定索引，从0开始
- (void)insertSubview:(UIView *)view aboveSubview:(UIView *)siblingSubview //插入一个子view到指定view之前
- (void)insertSubview:(UIView *)view belowSubview:(UIView *)siblingSubview //插入一个子view到指定view之后
- (void)exchangeSubviewAtIndex:(NSInteger)index1 withSubviewAtIndex:(NSInteger)index2 //交换两个view的索引
- (BOOL)isDescendantOfView:(UIView *)view //判断是不是指定元素的子节点或是其本身
Configuring the Resizing Behavior //配置尺寸改变行为
@property(nonatomic) UIViewAutoresizing autoresizingMask //当父元素窗口尺寸改变时，子节点如何去自适应变化
@property(nonatomic) BOOL autoresizesSubviews //子view是否自适应变化，默认为YES
@property(nonatomic) UIViewContentMode contentMode //view自适应变化的方式
- (CGSize)sizeThatFits:(CGSize)size //传递view的尺寸，返回建议的子view尺寸
- (void)sizeToFit //调整view的尺寸去适应其内容
Laying out Subviews //布局子节点
- (void)layoutSubviews //布局子view
- (void)setNeedsLayout //在下次更新中刷新布局
- (void)layoutIfNeeded //立即刷新布局
Opting in to Constraint-Based Layout //选择约束布局的方式
+ (BOOL)requiresConstraintBasedLayout //返回view是否是约束布局模式,ios6
- (BOOL)translatesAutoresizingMaskIntoConstraints //返回一个BOOL，判断自动布局是否可为转换约束布局，ios6
- (void)setTranslatesAutoresizingMaskIntoConstraints:(BOOL)flag //设置在约束布局系统中是否把自动布局转换为约束布局，ios6
Managing Constraints //约束管理
- (NSArray *)constraints //返回view的约束句柄，ios6
- (void)addConstraint:(NSLayoutConstraint *)constraint //添加约束句柄，ios6
- (void)addConstraints:(NSArray *)constraints //添加约束句柄数组，ios6
- (void)removeConstraint:(NSLayoutConstraint *)constraint //删除约束句柄，ios6
- (void)removeConstraints:(NSArray *)constraints //删除约束句柄数组，ios6
Measuring in Constraint-Based Layout //测量约束布局
- (CGSize)systemLayoutSizeFittingSize:(CGSize)targetSize //返回最合适的尺寸，ios6
- (CGSize)intrinsicContentSize //返回view的自然尺寸，ios6
- (void)invalidateIntrinsicContentSize //使内容尺寸无效化，ios6
- (UILayoutPriority)contentCompressionResistancePriorityForAxis:(UILayoutConstraintAxis)axis //待补充，ios6
- (void)setContentCompressionResistancePriority:(UILayoutPriority)priority forAxis:(UILayoutConstraintAxis)axis //待补充，ios6
- (UILayoutPriority)contentHuggingPriorityForAxis:(UILayoutConstraintAxis)axis //待补充，ios6
- (void)setContentHuggingPriority:(UILayoutPriority)priority forAxis:(UILayoutConstraintAxis)axis //待补充，ios6
Aligning Views with Constraint-Based Layout //校准约束布局
- (CGRect)alignmentRectForFrame:(CGRect)frame //待补充，ios6
- (CGRect)frameForAlignmentRect:(CGRect)alignmentRect //待补充，ios6
- (UIEdgeInsets)alignmentRectInsets //待补充，ios6
- (UIView *)viewForBaselineLayout //待补充，ios6
Triggering Constraint-Based Layout //触发约束布局
- (BOOL)needsUpdateConstraints //返回约束布局是否需要更新，YES为是，ios6
- (void)setNeedsUpdateConstraints //更新约束布局，ios6
- (void)updateConstraints //更新约束布局，ios6
- (void)updateConstraintsIfNeeded //更新约束布局及其子布局，ios6
Debugging Constraint-Based Layout //调试约束布局
- (NSArray *)constraintsAffectingLayoutForAxis:(UILayoutConstraintAxis)axis //待补充，ios6
- (BOOL)hasAmbiguousLayout //待补充，ios6
- (void)exerciseAmbiguityInLayout //待补充，ios6
Drawing and Updating the View //绘制和更新视图
- (void)drawRect:(CGRect)rect //在view中绘制一个矩形
- (void)setNeedsDisplay //使view重绘
- (void)setNeedsDisplayInRect:(CGRect)invalidRect //指定矩形重绘
@property(nonatomic) CGFloat contentScaleFactor //待补充
Formatting Printed View Content //格式化内容
- (UIViewPrintFormatter *)viewPrintFormatter //返回view的打印对象
- (void)drawRect:(CGRect)area forViewPrintFormatter:(UIViewPrintFormatter *)formatter //使用某个区域来打印
Managing Gesture Recognizers //管理手势
- (void)addGestureRecognizer:(UIGestureRecognizer *)gestureRecognizer //添加手势识别器
- (void)removeGestureRecognizer:(UIGestureRecognizer *)gestureRecognizer //删除手势识别器
@property(nonatomic, copy) NSArray *gestureRecognizers //获取手势集合
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer //通过返回值决定是否识别此手势
Animating Views with Blocks //使多个view执行动画
+ (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion //使一个或多个view执行动画
+ (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion //使一个或多个view执行动画
+ (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations //使一个或多个view执行动画
+ (void)transitionWithView:(UIView *)view duration:(NSTimeInterval)duration options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion //在一个view上创建过渡动画
+ (void)transitionFromView:(UIView *)fromView toView:(UIView *)toView duration:(NSTimeInterval)duration options:(UIViewAnimationOptions)options completion:(void (^)(BOOL finished))completion //
Animating Views //view动画
+ (void)beginAnimations:(NSString *)animationID context:(void *)context //标志动画代码开始
