Question

当用户按下UIButton时，我想更改我的UIButton上的图像。图像具有透明效果（仅显示边缘的.png）。问题是，当点击按钮时，一切正常（与其连接的其他功能），但应用程序会在一秒钟内覆盖2个不同的图像！当按下按钮时，我想显示第二个图像，并删除第一个图像（这变得不必要）。 PS：我不想使用图像阵列。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];

我的简单周期

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

这里是允许更改屏幕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];
}}

我想拥有相同的按钮，但要显示不同的图像

Answer 1

看起来你不会删除之前的按钮。

此外，您不必创建新按钮 - 您只需存储对按钮的引用，更改图像，更改动作目标（在添加新的之前删除旧的。）

Answer 2

我已经解决了几个循环，从视图中删除了所有：

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，我希望变为1.我这样做：

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

但是在第4号之后，我遇到了与之前相同的概述问题！

将UIButton图像更改为另一个目标C.

2 个答案: