用按钮放大图像？

Question

-(IBAction)bigger { 

    must.bounds.size = CGSizeMake(must.bounds.size.width +5.0 , must.bounds.size.height +5.0); 
} 

这是我输入的代码，但我得到的错误是表达式不可指派。必须是一个uiimageview。每次按下按钮时，我想让每个属性（高度和宽度）增大5.0。我怎样才能做到这一点。

Answer 1

你可能想要的是设置框架而不是边界。这样做：

CGRect frame = must.frame; 
frame.size.width += 5; 
frame.size.height += 5; 
must.frame = frame; 

Answer 2

//here u can get the image as bigger without moving its center point 


-(IBAction)bigger { 


    CGRect _bounds = must.bounds; 

    CGPoint centerPoint=must.center; 

    _bounds.size = CGSizeMake(must.bounds.size.width + 5.0 , must.bounds.size.height + 5.0); 

    must.bounds = _bounds; 

    must.center = centerPoint; 



}