将UIButton图像更改为另一个objective C
将UIButton图像更改为另一个objective C
提问于 2012-06-19 05:40:46
当用户按下我的UIButton上的图像时，我想要更改它。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)，但应用程序覆盖了两个不同的图像一个在第二个！当按钮被按下时，我想要显示第二个图像，并删除第一个(这变得不必要了)。PS:我不想使用图像数组。下面是按钮的代码：
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;
}} 这里的main函数允许更改屏幕上的主要形状。
-(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];
}}我希望有相同的按钮，但要显示不同的图像
回答 2
Stack Overflow用户
发布于 2012-06-19 05:57:46
看起来你永远不会移除以前的按钮。
此外，您不必创建新按钮-您可以简单地存储对按钮的引用、更改图像和更改操作目标(通过在添加新按钮之前删除旧按钮)。
Stack Overflow用户
发布于 2012-06-19 15:38:23
我已经解决了几个周期，用以下命令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，我希望它变成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总览问题！
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/11091505
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