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,一秒一秒!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];
}}