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当用户按下它时，我想更改我的 UIButton 上的图像。图像具有透明效果（它是仅显示边缘的 .png）。问题是，当点击按钮时，一切正常（连接到它的其他功能），但应用程序会覆盖 2 个不同的图像一个超过一秒！按下按钮时，我想显示第二张图像，并删除第一张图像（这变得不必要）。PS：我不想使用图像数组。这里是按钮的代码：

UIButton *overlayButton = [UIButton buttonWithType:UIButtonTypeCustom];
[overlayButton setImage:[UIImage imageNamed:@"image1.png"] forState:UIControlStateNormal];
[overlayButton setFrame:CGRectMake(20, 382, 120, 60)];
[overlayButton addTarget:self action:@selector(scanButtonPressed) forControlEvents:UIControlEventTouchUpInside]; //just graphics
[overlayButton addTarget:self action:@selector(buttonshapeClicked:) forControlEvents:UIControlEventTouchUpInside]; //just to set a variable i++ for my cycle
[overlayButton addTarget:self action:@selector(changeshape:) forControlEvents:UIControlEventTouchUpInside];  //function that changes another shape
[[self view] addSubview:overlayButton];

我的简单循环

- (void)buttonshapeClicked:(id)sender{
shape++;
if (shape == 4) {
    shape = 1;
        }}

这里是允许更改屏幕上主要形状的主要功能

 -(void) changeshape:(id)sender {
if (shape==1 && people==2) {
    //bottone forma
    UIButton *overlayButton = [UIButton buttonWithType:UIButtonTypeCustom];
    [overlayButton setImage:[UIImage imageNamed:@"passaquadrato.png"] forState:UIControlStateNormal];
    [overlayButton setFrame:CGRectMake(20, 382, 120, 60)];
    [overlayButton addTarget:self action:@selector(scanButtonPressed) forControlEvents:UIControlEventTouchUpInside];
    [overlayButton addTarget:self action:@selector(buttonshapeClicked:) forControlEvents:UIControlEventTouchUpInside];
    [overlayButton addTarget:self action:@selector(changeshape:) forControlEvents:UIControlEventTouchUpInside];
    [[self view] addSubview:overlayButton];

    //bottone people
    UIButton *overlayButtonp = [UIButton buttonWithType:UIButtonTypeCustom];
    [overlayButtonp setImage:[UIImage imageNamed:@"passatre.png"] forState:UIControlStateNormal];
    [overlayButtonp setFrame:CGRectMake(180, 382, 120, 60)];
    [overlayButtonp addTarget:self action:@selector(scanButtonPressed) forControlEvents:UIControlEventTouchUpInside];
    [[self view] addSubview:overlayButtonp];

    UIImageView *overlayImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"circle2.png"]];
    [overlayImageView setFrame:CGRectMake(20, 88, 280, 280)];
    [[self view] addSubview:overlayImageView];
}


else if (shape==2 && people==2) {
    //bottone forma
    UIButton *overlayButton = [UIButton buttonWithType:UIButtonTypeCustom];
    [overlayButton setImage:[UIImage imageNamed:@"passarettangolo.png"] forState:UIControlStateNormal];
    [overlayButton setFrame:CGRectMake(20, 382, 120, 60)];
    [overlayButton addTarget:self action:@selector(scanButtonPressed) forControlEvents:UIControlEventTouchUpInside];
    [overlayButton addTarget:self action:@selector(buttonshapeClicked:) forControlEvents:UIControlEventTouchUpInside];
    [overlayButton addTarget:self action:@selector(changeshape:) forControlEvents:UIControlEventTouchUpInside];
    [[self view] addSubview:overlayButton];

    //bottone people
    UIButton *overlayButtonp = [UIButton buttonWithType:UIButtonTypeCustom];
    [overlayButtonp setImage:[UIImage imageNamed:@"passatre.png"] forState:UIControlStateNormal];
    [overlayButtonp setFrame:CGRectMake(180, 382, 120, 60)];
    [overlayButtonp addTarget:self action:@selector(scanButtonPressed) forControlEvents:UIControlEventTouchUpInside];
    [[self view] addSubview:overlayButtonp];

    UIImageView *overlayImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"square2.png"]];
    [overlayImageView setFrame:CGRectMake(20, 88, 280, 280)];
    [[self view] addSubview:overlayImageView];
}}

我想要相同的按钮，但要显示不同的图像

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2 回答 2

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看起来您从未删除过以前的按钮。

此外，您不必创建新按钮 - 您可以简单地存储对按钮的引用、更改图像并更改操作目标（通过在添加新按钮之前删除旧按钮）。

于 2012-06-18T21:57:45.773 回答
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我已经解决了几个周期，从视图中删除所有内容：

for (int i = 0; i < [[self.view subviews] count]; i++ ) {
        [[[self.view subviews] objectAtIndex:i] removeFromSuperview];
    }

现在的问题是重新初始化循环，因为当我的变量变为 4 时，我希望它变为 1。我这样做：

- (void)buttonshapeClicked:(id)sender{shape++;
if (shape == 4) {
    shape = 1;
}}

但是在数字 4 之后，我遇到了和以前一样的概览问题！

于 2012-06-19T07:38:22.650 回答