UITouch

//
//  ViewController.m
//  UIWindowsApp
//
//  Created by  on 21/09/2017.
//  Copyright © 2017 . All rights reserved.
//

#import "ViewController.h"
#import "ViewController2.h"

@interface ViewController ()

@end

@implementation ViewController




- (void)viewDidLoad {
    [super viewDidLoad];
    
    UIImage* image = [UIImage imageNamed:@"1.jpg"];
    
    UIImageView* iView = [[UIImageView alloc]init];
    
    iView.image = image;
    
    iView.frame = CGRectMake(50, 100, 220, 300);
    
    iView.tag = 101;
    
    [self.view addSubview:iView];

    
}
//手指触碰到屏幕
-(void) touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    UITouch* touch = [touches anyObject];
    if(touch.tapCount == 1)
    {
        NSLog(@"单击"); //
    }else if(touch.tapCount == 2)
    {
        NSLog(@"双击666");//双击时会触发单击事件，什么鬼？？？
    }
    _mPtLast = [touch locationInView:self.view];
    NSLog(@"手指触碰瞬间");
}
//手指接触到屏幕，并且没有离开时被调用
-(void) touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    UITouch * touch = [touches anyObject];
    
    CGPoint pt = [touch locationInView:self.view];
    
    float xOffset = pt.x - _mPtLast.x;
    float yOffset = pt.y - _mPtLast.y;
    
    _mPtLast = pt;
    
    UIImageView * view  =(UIImageView*)[self.view viewWithTag:101];
    
    view.frame = CGRectMake(view.frame.origin.x+xOffset, view.frame.origin.y+yOffset, view.frame.size.width, view.frame.size.height);
    
    
    NSLog(@"x = %f,y=%f",pt.x,pt.y);
    
}
//手指离开时被调用
-(void) touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    NSLog(@"手指离开时被调用");
}

// 特殊情况下的中段事件，例如电话，信息切入时，会取消当前的手势。
// 用来做紧急的数据保存等
-(void) touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    NSLog(@"");
}



- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


@end

//
//  ViewController.h
//  UIWindowsApp
//
//  Created by
//  Copyright ©
//

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
{
   
    CGPoint _mPtLast;
    
    
}

//属性定义
//@property(retain,nonatomic) UITextField* textField;




@end