iOS中强制转换

iOS中强制转换

// 视图显示为横屏状态，温柔转换

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {

return (interfaceOrientation ==
UIInterfaceOrientationLandscapeLeft);

}

-(BOOL)shouldAutorotate {

return
YES;

}

-(UIInterfaceOrientationMask)supportedInterfaceOrientations {

return
UIInterfaceOrientationMaskLandscapeLeft;

}

// 强制旋转

- (IBAction)tranfromOnClick:(UIButton *)sender

{

if ([UIDevice
currentDevice].orientation ==
UIDeviceOrientationPortrait)

{

[[UIDevice
currentDevice] setValue:[NSNumber
numberWithInteger:UIDeviceOrientationPortrait]
forKey:@"orientation"];//这句话是防止手动先把设备置为横屏,导致下面的语句失效.

[[UIDevice
currentDevice] setValue:[NSNumber
numberWithInteger:UIDeviceOrientationLandscapeLeft]
forKey:@"orientation"];

} else {

[[UIDevice
currentDevice] setValue:[NSNumber
numberWithInteger:UIDeviceOrientationLandscapeLeft]
forKey:@"orientation"];//这句话是防止手动先把设备置为竖屏,导致下面的语句失效.

[[UIDevice
currentDevice] setValue:[NSNumber
numberWithInteger:UIDeviceOrientationPortrait]
forKey:@"orientation"];

}

}