方法一：利用私有API添加新图标

直接上代码：在具体视图控制器中重写addStatusBarImageNamed:removeOnExit:方法

- (void) addStatusBarImageNamed:(NSString*)image removeOnExit: (BOOL) remove {
   if(_statusbarimage!=nil && _responds) {
   if ([[[NSUserDefaults standardUserDefaults] objectForKey:@"statusBarEnabled"] integerValue] == 1) [self removeStatusBarImageNamed:_statusbarimage]; statusbarimage=image; } if (_responds) {
   if ([[[NSUserDefaults standardUserDefaults] objectForKey:@"statusBarEnabled"] integerValue] == 1) [super addStatusBarImageNamed:image removeOnExit: remove]; } }

 方法二：用新的UIWindow覆盖原来的状态栏

装载自：

首先继承UIWindow，及init的方法，关键语句self.windowLevel = UIWindowLevelAlert;

- (id)init {
       CGRect f = [[UIScreen mainScreen] bounds]; //获取屏幕区     CGRect s = [[UIApplication sharedApplication] statusBarFrame]; //获取状态栏框架区     self = [super initWithFrame:CGRectMake(0,0,f.size.width, s.size.height)]; if(self != nil) {
           self.windowLevel = UIWindowLevelAlert;         self.backgroundColor = [UIColor clearColor];          [self makeKeyAndVisible];     } return self; }