分类的一些问题 - 黑马程序员技术交流社区

@interface UIView(UIViewGeometry)
// animatable. do not use frame if view is transformed since it will not correctly reflect the actual location of the view. use bounds + center instead.
@property(nonatomic) CGRect frame;
// use bounds/center and not frame if non-identity transform. if bounds dimension is odd, center may be have fractional part
@property(nonatomic) CGRect bounds; // default bounds is zero origin, frame size. animatable
@property(nonatomic) CGPoint center; // center is center of frame. animatable
@property(nonatomic) CGAffineTransform transform; // default is CGAffineTransformIdentity. animatable
@property(nonatomic) CGFloat contentScaleFactor NS_AVAILABLE_IOS(4_0);
@property(nonatomic,getter=isMultipleTouchEnabled) BOOL multipleTouchEnabled; // default is NO
@property(nonatomic,getter=isExclusiveTouch) BOOL exclusiveTouch; // default is NO
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event; // recursively calls -pointInside:withEvent:. point is in the receiver's coordinate system
- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event; // default returns YES if point is in bounds
- (CGPoint)convertPoint:(CGPoint)point toView:(UIView *)view;
- (CGPoint)convertPoint:(CGPoint)point fromView:(UIView *)view;
- (CGRect)convertRect:(CGRect)rect toView:(UIView *)view;
- (CGRect)convertRect:(CGRect)rect fromView:(UIView *)view;
@property(nonatomic) BOOL autoresizesSubviews; // default is YES. if set, subviews are adjusted according to their autoresizingMask if self.bounds changes
@property(nonatomic) UIViewAutoresizing autoresizingMask; // simple resize. default is UIViewAutoresizingNone
- (CGSize)sizeThatFits:(CGSize)size; // return 'best' size to fit given size. does not actually resize view. Default is return existing view size
- (void)sizeToFit; // calls sizeThatFits: with current view bounds and changes bounds size.
@end

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