如何創建一個總是直接在圖像下面的圖像的框架更改大小的按鈕

Question

我目前正在使用此示例代碼來產生一個ImageView下面有一個按鈕，它會產生一個日誌，當按下。

- (void)loadView { 
[super loadView]; 

imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"SteveJobsMacbookAir.JPG"]]; 
[imageView setFrame:CGRectMake(80.0, 20.0, 160.0, 230.0)]; 
[imageView setContentMode:UIViewContentModeScaleAspectFit]; 

[[self view] addSubview:imageView]; 

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 
[button addTarget:self action:@selector(cropImage) forControlEvents:UIControlEventTouchUpInside]; 
[button setFrame:CGRectMake(124.0, 258.0, 72.0, 37.0)]; 
[button setTitle:@"Crop!" forState:UIControlStateNormal]; 

[[self view] addSubview:button]; 
} 

當我按下「裁剪！」時按鈕，上面圖像的尺寸更改大小：

- (void)cropImage { 
[imageView setFrame:CGRectMake(80.0, 20.0, 160.0, 230.0)]; 
} 

但是，按鈕保持在同一個地方，而不是在圖像下方。我怎樣才能調整圖像的框架，同時讓按鈕再次移動到正下方？

Answer 1

只需將y按鈕的位置賦予相對於imageView的y位置的變量即可。 試試這個

[button setFrame:CGRectMake(124.0, imageView.frame.size.height + imageView.frame.origin.y + 20, 72.0, 37.0)]; 

+20爲您提供了ImageView的和按鍵之間的一些空間。 希望這有助於:)

Answer 2

使用下面的代碼

- (void)loadView { 
[super loadView]; 

imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"SteveJobsMacbookAir.JPG"]]; 
[imageView setFrame:CGRectMake(80.0, 20.0, 160.0, 230.0)]; 
[imageView setContentMode:UIViewContentModeScaleAspectFit]; 

[[self view] addSubview:imageView]; 

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 
//Change bellow line 
[button addTarget:self action:@selector(cropImage:) forControlEvents:UIControlEventTouchUpInside]; 
[button setFrame:CGRectMake(124.0, 258.0, 72.0, 37.0)]; 
[button setTitle:@"Crop!" forState:UIControlStateNormal]; 

[[self view] addSubview:button]; 
} 
//Change to this function 
- (void)cropImage:(UIButton *)sender { 
[imageView setFrame:CGRectMake(80.0, 20.0, 160.0, 230.0)]; 
sender.center = CGPointMake(sender.center.x,imageView.center.y); 
}