ios7 各种汇总 定期更新

-(UIStatusBarStyle)preferredStatusBarStyle
{
    return UIStatusBarStyleLightContent;
}

-(void)viewWillLayoutSubviews{
    
    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7) {
        self.view.clipsToBounds = YES;
        CGRect screenRect = [[UIScreen mainScreen] bounds];
        CGFloat screenHeight = screenRect.size.height;
        self.view.frame =  CGRectMake(0, 20, self.view.frame.size.width,screenHeight-20);
        self.view.bounds = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
    }
}