xcode UIPageControl 不调用 valueChanged 上的选择器
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UIPageControl not calling selector on valueChanged
提问by AddisDev
I am attempting to use a UIPageControlfor the first time and I can't seem to get it to call a function on UIControlEventValueChanged. Am I missing something here? I even tried a storyboard implementation but same broken results. I tried UIControlEventTouchUpInsideand other actions as well. None are calling the changePage:function below.
我UIPageControl第一次尝试使用 a ，但似乎无法让它在UIControlEventValueChanged. 我在这里错过了什么吗？我什至尝试了故事板实现，但结果同样糟糕。我也尝试过UIControlEventTouchUpInside其他操作。没有人调用changePage:下面的函数。
In the .h:
在.h中：
@property (nonatomic, retain) UIPageControl *introPageControl;
-(IBAction)changePage:(id)sender;
In the .m:
在他们之中：
@synthesize introPageControl;
- (void)viewDidLoad {
[super viewDidLoad];
self.introPageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(0,208,self.view.frame.size.width,36)];
self.introPageControl.numberOfPages = 4;
self.introPageControl.currentPage = 0;
[self.introPageControl addTarget:self action:@selector(changePage:) forControlEvents:UIControlEventValueChanged];
[self.view addSubview:self.introPageControl];
}
-(IBAction)changePage:(id)sender {
// NEVER GETS CALLED :(
}
采纳答案by MrBr
The UIControlEventValueChanged is only called when the UIPageControl view object was tapped.
UIControlEventValueChanged 仅在点击 UIPageControl 视图对象时调用。
回答by Peter Kreinz
Swift 3:
斯威夫特 3：
pageControl.numberOfPages = 6
pageControl.currentPage = 0
pageControl.addTarget(self, action: #selector(pageControlTapHandler(sender:)), for: .touchUpInside)
...
func pageControlTapHandler(sender:UIPageControl) {
print("currentPage:", sender.currentPage) //currentPage: 1
}
