UIViewController present出来一个透明的UIViewController

UIViewController present出来一个透明的UIViewController  

其实很简单，代码如下

    MyViewController *checkOut = [[MyViewController alloc] init];

    checkOut.providesPresentationContextTransitionStyle = YES;

    checkOut.definesPresentationContext = YES;

    checkOut.modalPresentationStyle = UIModalPresentationOverCurrentContext;

    [self presentViewController:checkOut animated:YES completion:nil];

参考

http://stackoverflow.com/questions/21760698/ios-modalview-with-background-transparent