爲什麼UIInterfaceOrientation總是返回正確的？

Question

爲什麼UIInterfaceOrientation總是返回正確的？
當我完成旋轉時，總是在右邊結束，爲什麼？
PS：我只想景觀

下面是代碼

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
{ 
    switch (interfaceOrientation) 
    { 
     case UIInterfaceOrientationLandscapeLeft: 
      NSLog(@"Is Left"); 
     case UIInterfaceOrientationLandscapeRight: 
      NSLog(@"Is Right"); 
     default: ; 
    } 

    return UIInterfaceOrientationIsLandscape(interfaceOrientation); 
} 

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation 
{ 
    switch (fromInterfaceOrientation) 
    { 
     case UIInterfaceOrientationLandscapeLeft: 
      NSLog(@"From Left"); 
     case UIInterfaceOrientationLandscapeRight: 
      NSLog(@"From Right"); 
     default: ; 
    } 
} 

這裏是LOG

2012-08-23 17:45:28.074 Simulador 360[323:707] Is Right 
2012-08-23 17:45:28.126 Simulador 360[323:707] Is Right 
2012-08-23 17:45:28.131 Simulador 360[323:707] Is Left 
2012-08-23 17:45:28.132 Simulador 360[323:707] Is Right 
2012-08-23 17:45:28.138 Simulador 360[323:707] Is Left 
2012-08-23 17:45:28.140 Simulador 360[323:707] Is Right 
2012-08-23 17:45:31.160 Simulador 360[323:707] Is Right 
2012-08-23 17:45:31.167 Simulador 360[323:707] Is Right 
2012-08-23 17:45:31.977 Simulador 360[323:707] From Left 
2012-08-23 17:45:31.980 Simulador 360[323:707] From Right 
2012-08-23 17:45:35.684 Simulador 360[323:707] Is Left 
2012-08-23 17:45:35.687 Simulador 360[323:707] Is Right 
2012-08-23 17:45:35.691 Simulador 360[323:707] Is Left 
2012-08-23 17:45:35.693 Simulador 360[323:707] Is Right 
2012-08-23 17:45:36.502 Simulador 360[323:707] From Right 

Answer 1

你缺少break在你switch語句。在不調用break的情況下，執行將繼續執行到下一個案例，所以如果您的案例中的界面方向評估爲左側，則將執行左側和右側大小寫塊。

修復此通過在您的每一個案件的末尾插入break：

switch (interfaceOrientation) 
{ 
    case UIInterfaceOrientationLandscapeLeft: 
     NSLog(@"Is Left"); 
     break; 
    case UIInterfaceOrientationLandscapeRight: 
     NSLog(@"Is Right"); 
     break; 
    default: ; 
}