ios8 – 如何检测AVPlayerViewController的全屏模式

概述如何检测用户按下AVPlayerViewController的展开图标？ 我想知道电影播放时是否进入全屏模式. 也可以观察playerViewController.contentOverlayView的界限,并将其与[UIScreen mainScreen] .bounds进行比较,例如： self.playerViewController = [AVPlayerViewController ne 如何检测用户按下AVPlayerVIEwController的展开图标？
我想知道电影播放时是否进入全屏模式.解决方法 也可以观察playerVIEwController.contentOverlayVIEw的界限,并将其与[UIScreen mainScreen] .bounds进行比较,例如：

self.playerVIEwController = [AVPlayerVIEwController new];// do this after adding player VC as a child VC or in completion block of -presentVIEwController:animated:completion:[self.playerVIEwController.contentOverlayVIEw addobserver:self forKeyPath:@"bounds" options:NSkeyvalueObservingOptionNew | NSkeyvalueObservingOptionold context:NulL];...- (voID)observeValueForKeyPath:(Nsstring *)keyPath ofObject:(ID)object change:(NSDictionary<Nsstring *,ID> *)change context:(voID *)context {    if (object == self.playerVIEwController.contentOverlayVIEw) {        if ([keyPath isEqualToString:@"bounds"]) {            CGRect oldBounds = [change[NSkeyvalueChangeoldKey] CGRectValue],newBounds = [change[NSkeyvalueChangeNewKey] CGRectValue];            BOol wasFullscreen = CGRectEqualToRect(oldBounds,[UIScreen mainScreen].bounds),isFullscreen = CGRectEqualToRect(newBounds,[UIScreen mainScreen].bounds);            if (isFullscreen && !wasFullscreen) {                if (CGRectEqualToRect(oldBounds,CGRectMake(0,newBounds.size.height,newBounds.size.wIDth))) {                    NSLog(@"rotated fullscreen");                }                else {                    NSLog(@"entered fullscreen");                }            }            else if (!isFullscreen && wasFullscreen) {                NSLog(@"exited fullscreen");            }        }    }}

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