iPhone开发之手势的预习—— UITapGestureRecognizer pinch捏合 longPress长按 rotation旋转...

最新推荐文章于 2018-07-23 18:32:17 发布

最新推荐文章于 2018-07-23 18:32:17 发布 · 130 阅读

本文介绍如何在Objective-C中为ImageView添加多种手势响应，包括点击、长按、滑动和旋转等，并展示如何实现点击不同次数触发不同图片加载的逻辑。

新建工程，编辑控制器的.h文件如下：

//
//  ViewController.h
//  多媒体B
//
//  Created by apple on 15/9/4.
//  Copyright (c) 2015年 LiuXun. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@property (nonatomic, strong) UIImageView *imageView;
@end

编辑控制器的.m文件如下：

//
//  ViewController.m
//  多媒体B
//
//  Created by apple on 15/9/4.
//  Copyright (c) 2015年 LiuXun. All rights reserved.
//

#import "ViewController.h"
#define  WIDTH    [UIScreen mainScreen].bounds.size.width
#define  HEIGHT  [UIScreen mainScreen].bounds.size.height

/*
 注意：当为ImageView显示图片或其他的组件添加监听的话，就让这个组件添加对应的手势子控件。
   切记：手势效果和监听只对添加对应手势对象的控件起作用
 */

@interface ViewController ()

@end

@implementation ViewController

-(void) BuildImageView
{
    self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, WIDTH, HEIGHT)];
    [self.view addSubview:self.imageView];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
	
    [self BuildImageView];
    
    
    // 创建点击一次的手势
    UITapGestureRecognizer *tapGR1 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(addOneGirl)];
    
    [tapGR1 setNumberOfTapsRequired:1]; // 设置单击的次数
    [tapGR1 setNumberOfTouchesRequired:1]; // 设置手指的数量
    [self.view addGestureRecognizer:tapGR1];
    
    // 创建点击两次的手势
    UITapGestureRecognizer *tapGR2 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(addOneHotGirl)];
    [tapGR2 setNumberOfTapsRequired:2]; // 设置单击的次数
    [tapGR2 setNumberOfTouchesRequired:1]; // 设置手指的数量
    
    [self.view addGestureRecognizer:tapGR2];
    
    //如果不加下面的话会先调用单指单击中的处理，再调用单指双击中的处理
    [tapGR1 requireGestureRecognizerToFail:tapGR2];
    
    // 创建一个长按的手势
    UILongPressGestureRecognizer  *longPressGR = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(addOneVeryHotGirl:)];
    [self.view addGestureRecognizer:longPressGR];
    
    // 创建一个手指向上划的手势
    UISwipeGestureRecognizer *swipGPup = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(addOneMan)];
    [swipGPup setDirection:UISwipeGestureRecognizerDirectionUp];// 设置滑动方向向上
    [self.view addGestureRecognizer:swipGPup];
    
    // 创建一个手指向下划的手势
    UISwipeGestureRecognizer *swipGPdown = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(addOneHotMan)];
    [swipGPdown setDirection:UISwipeGestureRecognizerDirectionDown]; // 设置华东方向向下
    [self.view  addGestureRecognizer:swipGPdown];
    
    // 创建一个旋转的手势
    UIRotationGestureRecognizer *rotationGR = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(addOneVeryHotMan)];
    [self.view  addGestureRecognizer:rotationGR];
    
    // 创建一个捏动得手势
    UIPinchGestureRecognizer *pinchGR = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(addTwoGirls)];
    [self.view addGestureRecognizer:pinchGR];
    
}

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

-(void) addOneGirl
{
    self.imageView.image = [UIImage imageNamed:@"1.jpg"];
}

-(void)addOneHotGirl
{
    self.imageView.image = [UIImage imageNamed:@"2.jpg"];
}
-(void)addOneVeryHotGirl:(UILongPressGestureRecognizer *)sender
{
    if (sender.state == UIGestureRecognizerStateBegan) {
        self.imageView.image = [UIImage imageNamed:@"3.jpg"];
    }
    
}
-(void) addOneMan
{
    self.imageView.image = [UIImage imageNamed:@"4.jpg"];
}

-(void) addOneHotMan
{
  self.imageView.image = [UIImage imageNamed:@"5.jpg"];
}

-(void) addOneVeryHotMan
{
   self.imageView.image = [UIImage imageNamed:@"6.jpg"];
}

-(void) addTwoGirls
{
   self.imageView.image = [UIImage imageNamed:@"7.jpg"];
}

@end

运行结果如下：