iOS-自定义修改拍照界面retake和use按钮

-(UIView *)findView:(UIView *)aView withName:(NSString *)name{ 
    Class cl = [aView class]; 
    NSString *desc = [cl description]; 
   
    if ([name isEqualToString:desc]) 
        return aView; 
   
    for (NSUInteger i = 0; i < [aView.subviews count]; i++) 
    { 
        UIView *subView = [aView.subviews objectAtIndex:i]; 
        subView = [self findView:subView withName:name]; 
        if (subView) 
            return subView; 
    } 
    return nil; 
}
-(void)addSomeElements:(UIViewController *)viewController{

   
    UIView *PLCameraView=[self findView:viewController.view withName:@"PLCameraView"];
    UIView *bottomBar=[self findView:PLCameraView withName:@"PLCropOverlayBottomBar"];
    UIImageView *bottomBarImageForSave = [bottomBar.subviews objectAtIndex:0];
    UIButton *retakeButton=[bottomBarImageForSave.subviews objectAtIndex:0]; 
    [retakeButton setTitle:@"重拍" forState:UIControlStateNormal];  //左下角按钮
    UIButton *useButton=[bottomBarImageForSave.subviews objectAtIndex:1]; 
    [useButton setTitle:@"上传" forState:UIControlStateNormal];  //右下角按钮
}
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated{
 
    [self addSomeElements:viewController];
}