IOS 踩坑记

1. 标题栏

 // 隐藏标题栏
self.navigationController.navigationBarHidden = YES;

这句隐藏代码会对所有Controller 的标题栏产生影响，最好在调用以上隐藏代码时能够在controller 的生命周期方法中加入

//页面即将展示
- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    [self.navigationController setNavigationBarHidden:YES]; // 隐藏标题栏

    //去掉状态栏高度
    if([[[UIDevice currentDevice] systemVersion] floatValue] >= 7){
    CGRect viewBounds = [self.scrollView bounds];
    viewBounds.origin.y = -[[UIApplication sharedApplication] statusBarFrame].size.height;
    viewBounds.size.height = viewBounds.size.height;
    self.scrollView.frame = viewBounds;
    }
}


//viewWillDisappear 即将销毁·
- (void)viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear: animated];
    [self.navigationController setNavigationBarHidden:NO];
}