判断屏幕横屏/竖屏

• 在屏幕发生翻转的时候会调用一些方法:- (void)viewWillLayoutSubviews; / - (void)viewDidLayoutSubviews;以及- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id <UIViewControllerTransitionCoordinator>)coordinator

• 注意:这些方法都是在ViewController里面,在view中没有的

方法一:

• 使用- (void)viewWillLayoutSubviews;方法:

- (void)viewWillLayoutSubviews

{

     [self _shouldRotateToOrientation:(UIDeviceOrientation)[UIApplication sharedApplication].statusBarOrientation];

}

-(void)_shouldRotateToOrientation:(UIDeviceOrientation)orientation {
   if (orientation == UIDeviceOrientationPortrait ||orientation ==
                UIDeviceOrientationPortraitUpsideDown) { // 竖屏
          
    } else { // 横屏
         
}

方法二:

• 使用- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id <UIViewControllerTransitionCoordinator>)coordinator
  • size : 屏幕翻转后的新的尺寸;
  • coordinator : 屏幕翻转过程中的一些信息,比如翻转时间等;

#pragma mark - 屏幕翻转就会调用
- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator {

    // 记录当前是横屏还是竖屏
    BOOL isLandscape = size.width == kLandscapeWidth;
    
    // 翻转的时间
    CGFloat duration = [coordinator transitionDuration];
    
    [UIView animateWithDuration:duration animations:^{
       
        // 1.设置dockview的frame
        [self.dockView rotateToLandscape:isLandscape];
        
        // 2.屏幕翻转后(设置完dockview的frame)要重新设置contentView的x值
        self.contentView.x = self.dockView.width;
        
    }];
}

• 子控件提供了一个方法- (void)rotateToLandscape:(BOOL)isLandscape;根据传入的isLandscape参数即可知道当前的屏幕状态,便于设置子控件在不同屏幕状态下的frame