ios 如何以编程方式切换 UIsegmentedControll？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/5273775/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How do I switch UIsegmentedControll programmatically?
提问by Voloda2
How do I switch UISegmentedControllprogrammatically ?
如何以UISegmentedControll编程方式切换？
回答by Lachlan Roche
The selectedSegmentIndexproperty identifies the selected segment of a UISegmentedControl. Set this property to the any valid segment index, or UISegmentedControlNoSegment(-1) to turn off the current selection.
所述selectedSegmentIndex属性标识一个UISegmentedControl的所选择的段。将此属性设置为任何有效的段索引，或UISegmentedControlNoSegment(-1) 以关闭当前选择。
// select the first segment
segmented.selectedSegmentIndex = 0;
// turn off the current selection
segmented.selectedSegmentIndex = UISegmentedControlNoSegment;
回答by arcady bob
Alternatively, after you have changed the selectedSegmentIndex call 'sendActionsForControlEvents:' for example
或者，在您更改 selectedSegmentIndex 之后调用“sendActionsForControlEvents:”例如
segmentedControl.selectedSegmentIndex = 0
[segmentedControl sendActionsForControlEvents:UIControlEventValueChanged];
回答by Lirik
@jmstone response, true, this action will not invoke the valueChanged event for this control.
@jmstone 响应，true，此操作不会为此控件调用 valueChanged 事件。
One way to overcome this is to just call the function yourself:
克服这个问题的一种方法是自己调用函数：
segmentedControl.selectedSegmentIndex = 3;
[self valueChangedMethod:segmentedControl];
This will call:
这将调用：
- (void)valueChangedMethod:(UISegmentedControl *)segmentedControl
{
//continue your code here...
}
回答by Matias Elorriaga
In Swift:
在斯威夫特：
segmentedControl.selectedSegmentIndex = 1
Swift 2:
斯威夫特 2：
segmentedControl.sendActionsForControlEvents(UIControlEvents.ValueChanged)
Swift 3:
斯威夫特 3：
segmentedControl.sendActions(for: UIControlEvents.valueChanged)
回答by novecento88
EDIT:as Yogesh Nikam Patil made me notice, UIControlEvents has been renamed from UIControlEvents to UIControl.Event. I've updated my code accordingly.
编辑：正如 Yogesh Nikam Patil 让我注意到的那样，UIControlEvents 已从 UIControlEvents 重命名为 UIControl.Event。我已经相应地更新了我的代码。
@arcady bob answer was the one that did the trick for me.
@arcady bob 的回答对我有用。
I just post an updated version for SWIFT 5:
我刚刚发布了SWIFT 5的更新版本：
yourSegmentedControl.selectedSegmentIndex = 0
yourSegmentedControl.sendActions(for: UIControl.Event.valueChanged)
If you use just the first line, the segmented will react accordingly graphically, but your IBAction associated with the segmented control won't be called. In a few words: the second line is like tapping on the segmented control. This is what I needed and what I was missing.
如果您只使用第一行，分段将相应地以图形方式作出反应，但不会调用与分段控件关联的 IBAction。简而言之：第二行就像点击分段控件。这就是我所需要的，也是我所缺少的。
回答by Daniel Ryan
I've had a similar problem where the segmented control wasn't changing. I was calling "selectedSegmentIndex", etc too early. Once I called it after "viewDidLoad" was called then everything was fine again.
我有一个类似的问题，即分段控件没有改变。我过早地调用了“selectedSegmentIndex”等。一旦我在调用“viewDidLoad”之后调用它，那么一切又好了。
