崩潰

Question

此代碼（if語句與動畫）：

// works 
if (_camOrientation == UIDeviceOrientationPortrait) { 
    [UIView animateWithDuration:0.5f animations:^(void){ 
     [_distanceView setTransform:CGAffineTransformMakeRotation(degreesToRadian(0.0))]; 
    }]; 
} else if (_camOrientation == UIDeviceOrientationLandscapeLeft) { 
    [UIView animateWithDuration:0.5f animations:^(void){ 
     [_distanceView setTransform:CGAffineTransformMakeRotation(degreesToRadian(90.0))]; 
    }]; 
} 

這也適用（switch語句無動畫）：

// works 
switch (_camOrientation) { 
    case UIDeviceOrientationPortrait: 
     [_distanceView setTransform:CGAffineTransformMakeRotation(degreesToRadian(0.0))]; 
     break; 

    case UIDeviceOrientationLandscapeLeft: 
     [_distanceView setTransform:CGAffineTransformMakeRotation(degreesToRadian(90.0))]; 
     break; 

    default: 
     break; 
} 

這一個崩潰（帶動畫的開關語句）：

// crashes 
switch (_camOrientation) { 
    case UIDeviceOrientationPortrait: 
     [UIView animateWithDuration:0.5f animations:^(void){ 
      [_distanceView setTransform:CGAffineTransformMakeRotation(degreesToRadian(0.0))]; 
     }]; 
     break; 

    case UIDeviceOrientationLandscapeLeft: 
     [UIView animateWithDuration:0.5f animations:^(void){ 
      [_distanceView setTransform:CGAffineTransformMakeRotation(degreesToRadian(90.0))]; 
     }]; 
     break; 

    default: 
     break; 
} 

爲什麼我不能在switch語句中使用動畫塊？！？

Answer 1

你應該能夠:)

嘗試添加在你的情況下{ }這樣的：

case UIDeviceOrientationPortrait: { 
    [UIView animateWithDuration:0.5f animations:^void{ 
     [_distanceView setTransform:CGAffineTransformMakeRotation(0.0)]; 
    }]; 
    break; 
}