iOS7中让状态栏显示
希望对大家有用。。。。。。
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7)
{
[application setStatusBarStyle:UIStatusBarStyleLightContent];
self.window.clipsToBounds =YES;
self.window.frame = CGRectMake(0,20,self.window.frame.size.width,self.window.frame.size.height-20);
}