模态全屏模式，实现半透明效果

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self.view.window.rootViewController.modalPresentationStyle = UIModalPresentationCurrentContext; //半透明

        BiaoQianViewController *biaoQianVC = [[BiaoQianViewController alloc] init];

        biaoQianVC.modalPresentationStyle = UIModalPresentationOverFullScreen;

        biaoQianVC.view.frame = self.view.frame;

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

模态全屏模式，实现半透明效果

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原文地址：http://www.cnblogs.com/sgdkg/p/4832013.html