UIProgressView不顯示進度

Question

我不明白我躺在哪裏的雞蛋。我需要更新progreesView的進度。我在IB中創建UIProgressView並只更改顏色。我有屬性和下一個代碼

@property (weak, nonatomic) IBOutlet UIProgressView *progressView; 

屬性連接在IB到出口

- (void)viewDidLoad 
{ 
[super viewDidLoad]; 
self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"DefaultSS.png"]]; 
} 


- (void) viewDidAppear:(BOOL)animated 
{ 
    [self connectToServer]; 
} 


- (void) connectToServer 
{ 
    //some code... 
    sleep(2); 
[self.progressView setProgress:0.2 animated:YES]; 
sleep(1); 
[self.progressView setProgress:0.4 animated:YES]; 
sleep(1); 
[self.progressView setProgress:0.7 animated:YES]; 
sleep(1); 
[self.progressView setProgress:1.0 animated:YES]; 
sleep(1); 
//some code... 
} 

睡眠做工精良，但UIProgressView進度不隨時間而改變。我錯在哪裏？

Answer 1

sleep（）會阻塞主線程，因此不會發生UI更新。你需要使用NSTimer或類似的東西。