iOS 修改状态栏字体颜色

UIStatusBarStyleLightContent //白色文字
UIStatusBarStyleDefault //默认黑色
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleDefault;}
出来后：

-(void)viewWillDisappear:(BOOL)animated{
[super viewWillDisappear:animated];
[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleLightContent;}