Question

我想代表一个倒数计时器。进度视图应更改<70％ - 黄色，<50％-red的颜色。但是在更改ProgressTintColor后UIProgressView不会更新。（对于0＆lt; x＆lt; 0.5）。

但是当我评论

时它工作正常

[self.progressView setProgressTintColor: [UIColor redColor]]; //this line.

以下代码将每秒触发：

float value = (float)secondsLeft / (float)secTotalDuration;
if (value < 0.9) {
      if (isChange == NO) {
           //[self.progressView setTranslatesAutoresizingMaskIntoConstraints: NO]; //- I tried THIS.

          [self.progressView setProgressTintColor: [UIColor redColor]]; //LINE - #1
          [self.progressView setTrackTintColor: [UIColor clearColor]];

          isChange = YES;
      }

      dispatch_async(dispatch_get_main_queue(), ^{ //With or without mainqueue doen't affect Uiprogressview change while commenting LINE - #1
                [self.progressView setProgress:value animated:NO];
      });

      NSLog(@"Progress: %f", [self.progressView progress]);

和日志：

 Progress: 1.000000
 Progress: 0.800000
 Progress: 0.700000
 Progress: 0.500000 //Doesn't updated after this.
 Progress: 0.300000
 Progress: 0.200000

Answer 1

请试试这个：

-(void) updateProgress:(NSNumber *) value {

       //Progress Value           
         [self.progressView setProgress:value animated:NO];

      //Progress Color        
         if (value < 0.5) {

           [self.progressView setProgressTintColor: [UIColor redColor]];  
           [self.progressView setTrackTintColor: [UIColor clearColor]];   
         }
         else if (value < 0.7) {

          [self.progressView setProgressTintColor: [UIColor yellowColor]];  
          [self.progressView setTrackTintColor: [UIColor clearColor]];
         }
         else if (value < 1.0) {       

          [self.progressView setProgressTintColor: [UIColor greenColor]];  
          [self.progressView setTrackTintColor: [UIColor clearColor]];

         }
}

然后调用它

float value = (float)secondsLeft / (float)secTotalDuration;

[self performSelectorOnMainThread:@selector(updateProgress:) withObject:@(value) waitUntilDone:NO];

更改ProgressTintColor后，UIProgressView不会更新＆lt; = 0.5值

1 个答案: