UIView,动画,完成块,UIAlertView
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【中文标题】UIView,动画,完成块,UIAlertView【英文标题】:UIView, animate, completionblock, UIAlertView 【发布时间】:2013-10-23 00:41:30 【问题描述】:我有一个带有登录屏幕的应用程序,其中包含一个登录按钮和一个注册按钮,如果我检测到我无法访问互联网,我会通过显示覆盖视图来隐藏这些按钮
self.coveringview
现在我用这个视图的 alpha 做一些简单的动画,一旦完成,我希望弹出一个 alertview 来告诉用户发生了什么,在这段代码中你可以看到我通过发出警报来做到这一点。显示在 animatewithduration 的完成块中。
bahvior 不是我想要的,警报弹出太快而没有向用户显示我希望它显示的淡出,我该怎么办?
NetworkStatus netStatus = [reachability currentReachabilityStatus];
if(netStatus == NotReachable)
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"No Internet Connection"
message:@"Unable to connect to the server.
Please check your internet connection and try again."
delegate:self
cancelButtonTitle:nil
otherButtonTitles:@"OK", nil];
[UIView animateWithDuration:1.0
animations:^
self.coveringView.alpha = 1.0;
completion:^(BOOL finished)
// this is the problem here, I need to make this alert show up after
the fade out occurs completely
[alert show];
self.coveringView.hidden = NO;
];
else
[UIView animateWithDuration:1.0
animations:^
self.coveringView.alpha = 0.0;
completion:^(BOOL finished)
self.coveringView.hidden = YES;
];
【问题讨论】:
【参考方案1】:从 Interface Builder 中删除您的 self.coveringView.hidden = YES
并仅设置 alpha = 0
NetworkStatus netStatus = [reachability currentReachabilityStatus];
if(netStatus == NotReachable)
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"No Internet Connection"
message:@"Unable to connect to the server.
Please check your internet connection and try again."
delegate:self
cancelButtonTitle:nil
otherButtonTitles:@"OK", nil];
[UIView animateWithDuration:1.0
animations:^
self.coveringView.alpha = 1.0;
completion:^(BOOL finished)
// this is the problem here, I need to make this alert show up after the fade out occurs completely
if(finished)
[alert show];
];
else
[UIView animateWithDuration:1.0
animations:^
self.coveringView.alpha = 0.0;
completion:^(BOOL finished)
if(finished)
self.coveringView.hidden = YES;
];
【讨论】:
还是不行,弹出太快,我觉得这里多线程可能有问题?? 还是不做,我觉得还得再拖延一下。 尝试在完成块内初始化alertview 你能帮我做最后一次尝试吗,我会在几分钟内编辑答案 让我们continue this discussion in chat【参考方案2】:您不需要同时使用 setHidden 和 0.0 的 alpha 它们都会使视图不会拦截触摸。您的 hidden/notHidden 可能与 alpha 更改发生冲突。
尝试像这样简化:
NetworkStatus netStatus = [reachability currentReachabilityStatus];
if(netStatus == NotReachable)
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"No Internet Connection"
message:@"Unable to connect to the server.
Please check your internet connection and try again."
delegate:self
cancelButtonTitle:nil
otherButtonTitles:@"OK", nil];
[UIView animateWithDuration:1.0
animations:^
self.coveringView.alpha = 1.0;
completion:^(BOOL finished)
//I need to make this alert show up after the fade out occurs completely
[alert show];
];
else
[UIView animateWithDuration:1.0
animations:^
self.coveringView.alpha = 0.0;
completion:^(BOOL finished)
];
【讨论】:
嗨,这是对另一个主题的简化,但没有解决最初的问题,警报仍然突然出现。以上是关于UIView,动画,完成块,UIAlertView的主要内容,如果未能解决你的问题,请参考以下文章