使用目標動作時UISegmentedControl不改變背景圖片

Question

我的分段控件工作正常..只要我不附加目標動作偵聽器。但是，我必須能夠檢測其事件。

我的代碼：

NSArray *itemArray = [NSArray arrayWithObjects: @"Following", @"Everybody", @"Nearby", nil]; 
UISegmentedControl *segmentedControl = [[UISegmentedControl alloc] initWithItems:itemArray]; 
UIFont *font = [UIFont fontWithName:@"PatuaOne-Regular" size:12.0f]; 

UIColor *notChosenButtonColor = [UIColor colorWithRed:(201.0/255.0f) green:(198.0/255.0f) blue:(191.0/255.0f) alpha:1.0]; 
UIColor *chosenButtonColor = [UIColor colorWithRed:(235.0/255.0f) green:(218.0/255.0f) blue:(102.0/255.0f) alpha:1.0]; 

NSDictionary *normalAttributes = [NSDictionary dictionaryWithObjectsAndKeys: 
          font, UITextAttributeFont, 
          notChosenButtonColor, UITextAttributeTextColor, 
          [UIColor clearColor], UITextAttributeTextShadowColor, 
          nil]; 
NSDictionary *selectedAttributes = [NSDictionary dictionaryWithObjectsAndKeys: 
            font, UITextAttributeFont, 
            chosenButtonColor, UITextAttributeTextColor, 
            nil]; 
[segmentedControl setTitleTextAttributes:normalAttributes forState:UIControlStateNormal]; 
[segmentedControl setTitleTextAttributes:selectedAttributes forState:UIControlStateSelected]; 

[segmentedControl setBackgroundImage:[UIImage imageNamed:@"standard_bt.png"] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault]; 
[segmentedControl setBackgroundImage:[UIImage imageNamed:@"standard_bt_h.png"] forState:UIControlStateSelected barMetrics:UIBarMetricsDefault]; 


segmentedControl.frame = CGRectMake(5, 20, 280, 25); 
segmentedControl.segmentedControlStyle = UISegmentedControlStyleBordered; 


[segmentedControl setDividerImage:[UIImage imageNamed:@"separator.png"] 
      forLeftSegmentState:UIControlStateNormal 
       rightSegmentState:UIControlStateNormal 
        barMetrics:UIBarMetricsDefault]; 

[segmentedControl addTarget:self 
        action:@selector(segmentToggled:) 
      forControlEvents:UIControlEventValueChanged]; 

[headerView addSubview:segmentedControl]; 

- (void)segmentToggled:(UISegmentedControl*)sender 
{ 
    NSInteger index = sender.selectedSegmentIndex; 
    NSLog(@"index: %d",index); 
    if(index == 0){ 
     sender.selectedSegmentIndex = 0; 
     [self.feedDescription removeAllObjects]; 
     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{[[WebAPI sharedInstance]getFeed:0 max:100 count:5 controller:self];}); 
     [self.collectionView reloadData]; 
    }else if(index == 1){ 
     sender.selectedSegmentIndex = 1; 
     [self.feedDescription removeAllObjects]; 
     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{[[WebAPI sharedInstance]getFeed:0 max:100 count:5 controller:self];}); 
     [self.collectionView reloadData]; 
    }else if(index == 2){ 
     sender.selectedSegmentIndex = 2; 
     [self.feedDescription removeAllObjects]; 
     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{[[WebAPI sharedInstance]getFeed:0 max:100 count:5 controller:self];}); 
     [self.collectionView reloadData]; 
    } 


} 

我怎樣才能根據執行目標動作偵聽器的上方，還更新我UISegmentedControls背景圖片：

[segmentedControl setBackgroundImage:[UIImage imageNamed:@"standard_bt.png"] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault]; 
[segmentedControl setBackgroundImage:[UIImage imageNamed:@"standard_bt_h.png"] forState:UIControlStateSelected barMetrics:UIBarMetricsDefault]; 

Answer 1

試試這個代碼：

- (void)segmentToggled:(UISegmentedControl*)sender 
      { 
      for (int i=0; i<[sender.subviews count]; i++) 
       { 
        if ([[sender.subviews objectAtIndex:i] respondsToSelector:@selector(isSelected)] && [[sender.subviews objectAtIndex:i]isSelected]) 
        { 

        [sender setBackgroundImage:[UIImage imageNamed:@"standard_bt_h.png"] forState:UIControlStateSelected barMetrics:UIBarMetricsDefault]; 

        } 
        if ([[sender.subviews objectAtIndex:i] respondsToSelector:@selector(isSelected)] && ![[sender.subviews objectAtIndex:i] isSelected]) 
        { 
        [sender setBackgroundImage:[UIImage imageNamed:@"standard_bt.png"] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault]; 


        } 
       } 
      } 

Hope it Help You