// 1、首先苏姚到info.plist文件中添加最后一个字段；View controller-based status bar appearance
// 2。然后在AppDelegate内实现
[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleLightContent;
/改变状态栏背景颜色
UIView *statusBarView=[[UIView alloc] initWithFrame:CGRectMake(0, 0, kWidth, 50)];
statusBarView.backgroundColor=[UIColor tintColor];
[self.view addSubview:statusBarView];
[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleLightContent;
