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这是我在 SOF 上的第一篇文章。我是objective-c的新程序员。这是我正在处理的“问题”

我创建了 2 个 UIbutton ：一个从屏幕顶部拉出 UIImageView，另一个将其推回。我有动作的代码**，但我不知道如何将它与 if 语句关联起来，如果（按下按钮 1）然后拉视图 else（按下按钮 2）然后推回视图。

-(void)viewDidLoad{
{super viewDidLoad]

UIButton *button1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
 button1.frame = CGRectMake(200, 0, 90, 30);
[button1 addTarget:self action:@selector(buttonPressed1) forControlEvents:UIControlEventTouchUpInside];
 [self.view addSubview:button1];

UIButton *button2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
 button2.frame = CGRectMake(400, 0, 90, 30);
[button2 addTarget:self action:@selector(buttonPressed2) forControlEvents:UIControlEventTouchUpInside];
 [self.view addSubview:button2];
}


**

-(void)buttonPressed1 {

 double speed = 1 / round(random() % 100) + 1.0;

 UIImageView *banetteView2 = [[UIImageView alloc] initWithImage:banetteImage];
 banetteView2.frame = CGRectMake(100, -740, 568, 790);
 banetteView2.opaque = NO;
 [self.view addSubview:banetteView2];

 [UIView beginAnimations:nil context:banetteView2];
 [UIView setAnimationDuration: 2*speed ];

 //banetteView2.frame = CGRectMake(100, -1, 568, 790);

 UIImageView *banetteView = [[UIImageView alloc] initWithImage:banetteImage];
 banetteView.frame = CGRectMake(100, -740, 568, 790);
 banetteView.opaque = NO;
 banetteView.hidden = YES;
 [self.view addSubview:banetteView];


 [UIView setAnimationDidStopSelector:@selector(onAnimationComplete:finished:context:)];
 [UIView setAnimationDelegate:self];
 [UIView commitAnimations];


}

- (void)onAnimationComplete:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context {

 UIImageView *banetteView2 = context;
 [banetteView2 release];


 double speed = 1 / round(random() % 100) + 1.0;
 banetteView2.frame = CGRectMake(100, 0, 568, 790);
 banetteView2.opaque = NO;
 [self.view addSubview:banetteView2];

 [UIView beginAnimations:nil context:banetteView2];
 [UIView setAnimationDuration: 2*speed ];

 //banetteView2.frame = CGRectMake(100, -740, 568, 790);

}
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2 回答 2

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我不确定这是否适用于 UIButtons，但对于常规 Cocoa 按钮，您可以为发件人添加一个参数，如下所示：

-(void)buttonPressed1:(id)sender
{
    // And now you can check which button is the sender
    if(sender==button1)
        // Do stuff....
}

然后当然你需要在设置按钮操作时在选择器上添加一个冒号：@selector(buttonPressed1:)

于 2010-10-14T15:00:46.920 回答
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我通过改编这段代码发现

http://mobile.tutsplus.com/tutorials/iphone/iphone-sdk-learning-about-touch-events-basic-game-animation/

于 2010-10-22T09:08:40.760 回答