细分控制色调颜色

Question

Am changing the color of the selected segment. It works fine but uisegment control tint color is set to default until it is touched for the first time.

This is the method that changes the color for the selected segment. It works fine but when the segment shows up first time. It has pale gray color. Then when touched it starts working fine as I needed.

(This segment control is added as subview to 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

you can call segmentControlValueChanged method forcefully in viewDidLoad method. Like this:

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

Answer 2

Can you please change it from viewdidload or viewwillappear method of your view? because as per your code, it will change, when user first time touch it.

Answer 3

truy this code

i solved my app in this code

- (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

I figured it out myself. Since alertview creates all the views only after [alertview show]. color changes to segmentcontrol is not afftected since segmentcontrol is not really created yet. So what I did was I delayed the process of segmentcontrol tintcolor changes until it's been created by alertview

[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];

});