ios 模态半透明弹出框

<span style="color:#FF0000;">1. didSelectRowAtIndexPath</span>

if ([[UIDevice currentDevice].systemVersion floatValue] >= 8.0) {
detailVC.providesPresentationContextTransitionStyle = YES;
detailVC.definesPresentationContext = YES;
detailVC.modalPresentationStyle = UIModalPresentationOverCurrentContext;
[self presentViewController:detailVC animated:YES completion:^{

}];
}else
{
self.view.window.rootViewController.modalPresentationStyle = UIModalPresentationCurrentContext;
[self presentViewController:detailVC animated:YES completion:^{

}];
}

2.
self.view.backgroundColor = [UIColor clearColor];
UIView *alphaView = [[UIView alloc] initWithFrame:self.view.frame];
UIView *baseView = [[UIView alloc] initWithFrame:self.view.frame];
alphaView.backgroundColor = [UIColor clearColor];
baseView.backgroundColor = [UIColor blackColor];
baseView.alpha = 0.6;
[self.view addSubview:baseView];
[self.view addSubview:alphaView];