iOS中实现单个页面支持横竖屏(其他页面只能竖屏)

一直APP都是只支持竖屏的,现在需求是一个界面要支持横屏,于是在网上找到的解决方案,这里记录一哈:

1 首先需要Xcode中选中支持的屏幕方向

iOS中实现单个页面支持横竖屏(其他页面只能竖屏)_第1张图片
image

2 .

在Appdelegate中 .h

@property (nonatomic,assign)NSInteger allowRotate;

.m中

//此方法会在设备横竖屏变化的时候调用
- (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window{
     if (_allowRotate == 1) {
        return UIInterfaceOrientationMaskAll;
    }else{
        return (UIInterfaceOrientationMaskPortrait);
    }
}
// 返回是否支持设备自动旋转
- (BOOL)shouldAutorotate
{
    if (_allowRotate == 1) {
        return YES;
    }
    return NO;
}

3 在需要支持横竖屏的controller中:

viewWillApplear 中

//在视图出现的时候,将allowRotate改为1,
 AppDelegate * delegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
delegate.allowRotate = 1;

viewWillDisappear中

//在视图出现的时候,将allowRotate改为0,
 AppDelegate * delegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
   delegate.allowRotate = 0;

写好以上代码之后, 会发现一些问题: 当横屏页面直接点击“返回”按钮退出的时候, 页面依然是横屏, 而我们需要的是仅一个页面可以横屏,测试需要在viewWillDisappear中加入如下代码:

if ([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]) {
        SEL selector = NSSelectorFromString(@"setOrientation:");
        NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]];
        [invocation setSelector:selector];
        [invocation setTarget:[UIDevice currentDevice]];
        int val = UIInterfaceOrientationPortrait;
        [invocation setArgument:&val atIndex:2];
        [invocation invoke];
    }

此时就可以使app仅有设置页面支持横竖屏了!
此时如果app要求用户在横屏 竖屏的模式下改变UI(横屏与竖屏对应不同的UI), 可以在以下方法中执行

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
    // do something before rotation  
  if (toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft || toInterfaceOrientation == UIInterfaceOrientationLandscapeRight) {
        屏幕从竖屏变为横屏时执行
    }else{
        屏幕从横屏变为竖屏时执行
    }
  }
- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{
    // do something after rotation
}

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