UISegmentedControl 在 iOS5 中未检测到段更改
我有一个 UISegmentedControl
UIBarButtonItem *flex = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil]autorelease];
bottomSegmentedControl = [[UISegmentedControl alloc] initWithItems:nil];
[bottomSegmentedControl insertSegmentWithImage:[UIImage imageNamed:@"messages.png"] atIndex:0 animated:YES];
[bottomSegmentedControl insertSegmentWithImage:[UIImage imageNamed:@"news.png"] atIndex:1 animated:YES];
[bottomSegmentedControl insertSegmentWithImage:[UIImage imageNamed:@"chart.png"] atIndex:2 animated:YES];
//bottomSegmentedControl = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObjects:@"Messages",@"News",@"Chart", nil]];
//bottomSegmentedControl.tintColor = [UIColor blackColor];
[bottomSegmentedControl addTarget:self action:@selector(segmentedControlChanged:)forControlEvents:UIControlEventValueChanged];
bottomSegmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;
bottomSegmentedControl.frame = CGRectMake(0,0,300,30);
bottomSegmentedControl.momentary = NO;
[bottomSegmentedControl setSelectedSegmentIndex:0];
UIBarButtonItem *segButton = [[UIBarButtonItem alloc] initWithCustomView:bottomSegmentedControl];
当我单步执行程序时 [bottomSegmentedControl setSelectedSegmentIndex:0]; 不会触发 UIControlEventValueChanged 事件，这是我在 segmentedControlChanged: 中执行一些操作的
地方适用于 iOS 4.3，但不适用于 iOS5。我该如何解决这个问题？
I have a UISegmentedControl
UIBarButtonItem *flex = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil]autorelease];
bottomSegmentedControl = [[UISegmentedControl alloc] initWithItems:nil];
[bottomSegmentedControl insertSegmentWithImage:[UIImage imageNamed:@"messages.png"] atIndex:0 animated:YES];
[bottomSegmentedControl insertSegmentWithImage:[UIImage imageNamed:@"news.png"] atIndex:1 animated:YES];
[bottomSegmentedControl insertSegmentWithImage:[UIImage imageNamed:@"chart.png"] atIndex:2 animated:YES];
//bottomSegmentedControl = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObjects:@"Messages",@"News",@"Chart", nil]];
//bottomSegmentedControl.tintColor = [UIColor blackColor];
[bottomSegmentedControl addTarget:self action:@selector(segmentedControlChanged:)forControlEvents:UIControlEventValueChanged];
bottomSegmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;
bottomSegmentedControl.frame = CGRectMake(0,0,300,30);
bottomSegmentedControl.momentary = NO;
[bottomSegmentedControl setSelectedSegmentIndex:0];
UIBarButtonItem *segButton = [[UIBarButtonItem alloc] initWithCustomView:bottomSegmentedControl];
When I step through the program [bottomSegmentedControl setSelectedSegmentIndex:0]; does not trigger a UIControlEventValueChanged event which is where I do some stuff in segmentedControlChanged:
This used to work in iOS 4.3 but not in iOS5. How can I resolve this?
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这个问题已在这里得到解答： https://stackoverflow.com/a/8054774/883413
在 iOS5 中，来自 a 的事件如果以编程方式更改值，则不再触发 UISegmentedControl，以与其他 UIControl 的行为保持一致。
一个快速的解决方案是添加：
之后
，它会
在 iOS<5 中调用您的选择器两次
This question has been answered here: https://stackoverflow.com/a/8054774/883413
In iOS5 the events from a UISegmentedControl are no longer fired if the value is changed programatically, to keep consistency with the behaviour of other UIControls.
A quick solution is to add:
after
however it will call your selector
twice in iOS<5
这似乎是一个已知问题。目前尚不清楚苹果是否认为新行为是一项功能还是一个错误。
This seems to be a known issue. It's not clear whether Apple considers the new behavior to be a feature or a bug.