xcode 为什么 UIProgressView 不更新？
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Why does UIProgressView not update?
提问by user1940136
I'm trying to set the progress of a UIProgressView, but the progressView doesn't "update". Why? Do you know what I am doing wrong?
我正在尝试设置 UIProgressView 的进度，但 progressView 不会“更新”。为什么？你知道我做错了什么吗？
Here is my code in ViewController.h:
这是我在 ViewController.h 中的代码：
IBOutlet UIProgressView *progressBar;
That's the code in ViewController.m:
这是 ViewController.m 中的代码：
- (void)viewDidLoad
{
[super viewDidLoad];
progressBar.progress = 0.0;
[self performSelectorOnMainThread:@selector(progressUpdate) withObject:nil waitUntilDone:NO];
}
-(void)progressUpdate {
float actual = [progressBar progress];
if (actual < 1) {
progressBar.progress = actual + 0.1;
[NSTimer scheduledTimerWithTimeInterval:1.0 target:self `selector:@selector(progressUpdate) userInfo:nil repeats:NO];`
}
else {
}
}
回答by OlavJ
Try calling [progressBar setProgress:<value> animated:YES];instead of progressBar.progress = <value>
尝试调用[progressBar setProgress:<value> animated:YES];而不是progressBar.progress = <value>
EDIT: Take a look at this, which looks a lot like your example: Objective c : How to set time and progress of uiprogressview dynamically?
编辑：看看这个，它看起来很像你的例子：目标 c：如何动态设置 uiprogressview 的时间和进度？
回答by Zachary Christopoulos
Double check that progressBar is linked correctly in Interface Builder.
仔细检查progressBar 是否在Interface Builder 中正确链接。
If it still doesn't work, try using [progressBar setProgress:0];and [progressBar setProgress:actual+0.1];.
如果它仍然不起作用，请尝试使用[progressBar setProgress:0];和[progressBar setProgress:actual+0.1];。
Also know that the UIProgressView has a [progressBar setProgress:<value> animated:YES];method. May look cleaner.
也知道 UIProgressView 有一个[progressBar setProgress:<value> animated:YES];方法。可能看起来更干净。
回答by HugoMasterPL
Its should look like this:
它应该是这样的：
- (void)viewDidLoad
{
[super viewDidLoad];
progressBar.progress = 0.0;
[self performSelectorInBackground:@selector(progressUpdate) withObject:nil];
}
-(void)progressUpdate {
for(int i = 0; i<100; i++){
[self performSelectorOnMainThread:@selector(setProgress:) withObject:[NSNumber numberWithFloat:(1/(float)i)] waitUntilDone:YES];
}
}
- (void)setProgress:(NSNumber *)number
{
[progressBar setProgress:number.floatValue animated:YES];
}
回答by Vincent
I had the same problem this morning. It appeared that the progressBar was partly over a UITableView. I moved it a little, so that it was not overlapping anymore.
今天早上我遇到了同样的问题。似乎进度条部分位于 UITableView 之上。我稍微移动了它，使其不再重叠。
I'm not sure why this is. It should have been working in the original case, but that is how I solved it.
我不确定这是为什么。它应该在原始案例中有效，但我就是这样解决的。
