UITouch.h

#import <Foundation/Foundation.h>
#import <CoreGraphics/CoreGraphics.h>
#import <UIKit/UIKitDefines.h>

@class UIWindow, UIView;

typedef NS_ENUM(NSInteger, UITouchPhase) {
    UITouchPhaseBegan,            
    UITouchPhaseMoved,            
    UITouchPhaseStationary,       
    UITouchPhaseEnded,            
    UITouchPhaseCancelled,        
};

NS_CLASS_AVAILABLE_IOS(2_0) @interface UITouch : NSObject

@property(nonatomic,readonly) NSTimeInterval      timestamp;    // 产生时间
@property(nonatomic,readonly) UITouchPhase        phase;        // 事件的阶段（手指是什么状态）
@property(nonatomic,readonly) NSUInteger          tapCount;     // 短时间内点击的次数

@property(nonatomic,readonly,retain) UIWindow    *window;   //  触摸产生的窗口
@property(nonatomic,readonly,retain) UIView      *view;     // 触摸产生的view
@property(nonatomic,readonly,copy)   NSArray     *gestureRecognizers NS_AVAILABLE_IOS(3_2);

- (CGPoint)locationInView:(UIView *)view;               // 返回触摸的位置
- (CGPoint)previousLocationInView:(UIView *)view;       // 上一个触摸点

@end