使用UIGestureRecognizer监听屏幕事件

转载自  http://blog.csdn.net/samguoyi/article/details/7911499

如果只是想获取屏幕点击事件有一个最简单的办法，就是写一个透明的uibutton覆盖在需要获取点击事件的view上面。

这里用第二种办法：

UIGestureRecognizer有很多继承自它的UIxxxGestureRecognizer：

UILongPressGestureRecognizer

UIPanGestureRecognizer

UIPinchGestureRecognizer

UIRotationGestureRecognizer

UISwipeGestureRecognizer

UITapGestureRecognizer

可以响应很多的点击事件，这里的demo介绍点击事件。

        //
        //  MainViewController.m
        //  testapple
        //
        //  Created by kiri on 12-5-8.
        //  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.
        //  

        #import "MainViewController.h"  

        @implementation MainViewController
        @synthesize imageview;  

        #pragma mark - View lifecycle  

        // Implement loadView to create a view hierarchy programmatically, without using a nib.
        - (void)loadView
        {
            [super loadView];
            self.view.tag = ;  

            UITapGestureRecognizer *singleOne = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(onviewtabed:)];
            singleOne.numberOfTouchesRequired = ;
            singleOne.numberOfTapsRequired = ;
            singleOne.delegate = self;
            [self.view addGestureRecognizer:singleOne];  

            UILongPressGestureRecognizer *longpress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(onlongtabed:)];
            longpress.minimumPressDuration = 1.0;///至少按1秒
            longpress.numberOfTouchesRequired = ;//只有一个触点
            [self.view addGestureRecognizer:longpress];
            [longpress release];  

            UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
            [button setTitle:@"button" forState:UIControlStateNormal];
            button.frame = CGRectMake(, , , );
            [button addTarget:self action:@selector(onbuttonclick) forControlEvents:UIControlEventTouchUpInside];
            [self.view addSubview:button];      

            UITapGestureRecognizer *singleTwo = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(onviewtabed:)];
            singleTwo.numberOfTouchesRequired = ;
            singleTwo.numberOfTapsRequired = ;
            singleTwo.delegate = self;  

            self.imageview = [[UIImageView alloc] init];
            imageview.frame = CGRectMake(, , , );
            imageview.image = [UIImage imageNamed:@"test.png"];
            imageview.tag = ;
            [imageview addGestureRecognizer:singleTwo];
            imageview.multipleTouchEnabled = YES;//设置属性使得uiimageview可以响应屏幕事件
            imageview.userInteractionEnabled = YES;
            [self.view addSubview:imageview];  

            aaaimg = [UIImage imageNamed:@"aaa.jpg"];
            bbbimg = [UIImage imageNamed:@"bbb.jpg"];
            imageview.image = aaaimg;  

        }  

        - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
        {
            NSLog(@"gestureRecognizer");
            return ([[touch.view class] isSubclassOfClass:[UIButton class]]) ? NO : YES;///当点击按钮时使得原按钮事件去响应，而不是gesture事件
        }  

        -(void)onviewtabed:(UITapGestureRecognizer *)sender
        {
            NSLog(@"view touchs on tag = %d",sender.view.tag);
            if(sender.state != UIGestureRecognizerStateEnded && sender.state != UIGestureRecognizerStateFailed)///注意需要判断状态
            {
                ///do things
            }
        }  

        -(void)onlongtabed:(UILongPressGestureRecognizer *)sender
        {
            NSLog(@"on long tabed");
        }  

        // Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
        - (void)viewDidLoad
        {
            [super viewDidLoad];
        }  

        -(void)opinbackthread
        {  

        }  

        #pragma mark - myfunctions
        -(void)onbuttonclick
        {
            NSLog(@"onbuttonclick");  

        }  

        - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
        {  

            return (interfaceOrientation == UIInterfaceOrientationPortrait) || (interfaceOrientation == UIInterfaceOrientationLandscapeRight);
        }  

        -(void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
        {
            NSLog(@"did rotate");
        }  

        -(void)dealloc
        {
            [super dealloc];
        }  

        @end