Question

我正在改变所选片段的颜色。它工作正常但是uisegment控制色调颜色被设置为默认值，直到它第一次被触摸。

这是更改所选分段颜色的方法。它工作正常，但当细分市场第一次出现时。它有浅灰色。然后当它被触摸时，它会在我需要时开始正常工作。

（此段控件作为子视图添加到uialertview）

 -(void)segmentValueChanged:(UISegmentedControl*)sender 
  {

        for (int i=0; i<[sender.subviews count]; i++)
        {
            if ([[sender.subviews objectAtIndex:i]isSelected] )
            {
                UIColor *tintcolor=[UIColor colorWithRed: 98/255.0 green:156/255.0 blue:247/255.0 alpha:1.0];
                [[sender.subviews objectAtIndex:i] setTintColor:tintcolor];

                trackType = sender.selectedSegmentIndex;
            }
            else{
                UIColor *tintcolor=[UIColor colorWithRed: 225/255.0 green:220/255.0 blue:210/255.0 alpha:1.0];
                [[sender.subviews objectAtIndex:i] setTintColor:tintcolor];
            }

        }

    }

Answer 1

您可以在 viewDidLoad 方法中强制调用segmentControlValueChanged方法。像这样：

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 0.05 * NSEC_PER_SEC), dispatch_get_main_queue(), ^{
        [self segmentedControlValueChanged:segmentedControlOne];
    });

Answer 2

您可以从viewdidload或viewwillappear方法中更改它吗？因为根据您的代码，当用户第一次触摸它时它会发生变化。

Answer 3

打开这段代码

我在这段代码中解决了我的应用

- (void)viewDidAppear:(BOOL)animated

    {

        for(UIView *v in [self.view subviews] )
        {
            if([v isKindOfClass:[UISegmentedControl class]])
            {
               // ((UISegmentedControl*)v).enabled=NO;

                dispatch_async(dispatch_get_main_queue(),^{

                    for (int i=0; i<[ ((UISegmentedControl*)v).subviews count]; i++)

                    {

                        if ([[((UISegmentedControl*)v).subviews objectAtIndex:i]isSelected] )

                        {

                            [[((UISegmentedControl*)v).subviews objectAtIndex:i] setTintColor:[UIColor colorWithRed: 0/255.0 green:176/255.0 blue:223/255.0 alpha:1.0]];
                            //[[((UISegmentedControl*)v).subviews objectAtIndex:0]setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
                            //  break;

                        }
                        else
                        {
                            [[((UISegmentedControl*)v).subviews objectAtIndex:i] setTintColor:[UIColor whiteColor]];
                            //[[((UISegmentedControl*)v).subviews objectAtIndex:0]setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

                        }


                    }


                });

            }
        }

    }

Answer 4

我自己想通了。由于alertview仅在[alertview show]之后创建所有视图。由于尚未真正创建segmentcontrol，因此不会检测到segmentcontrol的颜色更改。所以我做的是我推迟了段控制色彩变化的过程，直到它被alertview创建

[alertview show];

double delayInSeconds = 0.01;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
    [self performSelectorOnMainThread:@selector(segmentValueChanged:) withObject:segControl waitUntilDone:YES];

});

uisegment控制色调

4 个答案: