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];
}