Xcode：如何在图像触摸时更改图像（相同位置）？ [英] Xcode: How to change Image on Touching at an Image (same Position)?

问题描述

简单地说，我已经在UIView中使用Interface Builder放置了一个图像。现在我想在触摸该图像时运行一个方法/函数，例如当应该加载另一个图像时。

Simply, I have placed an image with the Interface Builder in a UIView. Now I want to run a method/function when I am touching that image, for example when another image should be loaded.

我的代码：

- (void)touchesended:(NSSet*) touches withEvent:(UIEvent *)event 
{
    // UITouch *touch = [touch anyObject];
    bild_1_1.image = [UIImage imageNamed:@"t_1_4.jpg"];
}

推荐答案

您需要处理触摸事件来自你是UIView。要做到这一点，你应该创建UIView的子类并添加你的 touchesBegan：withEvent：方法的实现，这里最简单的例子：

You need handle touch event from you UIView. To do it you should create subclass of UIView and add your realisation of touchesBegan:withEvent: method, here simplest example:

//  TouchSimpleView.h
@interface TouchSimpleView : UIImageView {
    id  delegate;
}
@property(retain) id delegate;
@end

@interface NSObject(TouchSimpleView)
-(void)didTouchView:(UIView *)aView;
@end 

//  TouchSimpleView.m
#import "TouchSimpleView.h"
@implementation TouchSimpleView
@synthesize delegate;
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    NSLog(@"touchesBegan!!! ");
    if ( delegate != nil && [delegate respondsToSelector:@selector(didTouchView:)] ) {
        [delegate didTouchView:self];
    } 
    [super touchesBegan:touches withEvent:event];
}
@end

然后你可以使用这个类的视图想要处理触摸，例如：

Then you can use views of this class when you want to handle touches, for example:

- (void)applicationDidFinishLaunching:(UIApplication *)application {    
    [window makeKeyAndVisible];
    touchView = [[TouchSimpleView alloc] initWithFrame:CGRectMake(50, 50, 200, 300)];
    touchView.delegate = self;
    [window addSubview:touchView];

    imageView =[[UIImageView alloc] initWithFrame:touchView.frame];
    imageView.image = [UIImage imageNamed:@"image1.png"];
    [touchView addSubview:imageView];
}

-(void)didTouchView:(UIView *)aView{
    NSLog(@"view touched, changing image");
    imageView.image = [UIImage imageNamed:@"image2.png"];
}

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