UIScrollViewDelegate 不工作
您好，我正在尝试在用户滚动应用程序时触发一个功能。
这是我的代码
，我定义了一个实现 UIScrollViewDelegate 的类 MyViewController
@interface CircleViewController : UIViewController <UIScrollViewDelegate> {
UIScrollView *scroll;
}
@property (retain, nonatomic) UIScrollView * scroll;
@end
然后，在 .m 中，在我编写的 ViewDidLoad 中：
- (void)viewDidLoad {
[super viewDidLoad];
self.scroll = [[UIScrollView alloc] init];
scroll.delegate = self;
[scroll setBackgroundColor:[UIColor whiteColor]];
NSInteger nbView = 3;
scroll = [[UIScrollView alloc] initWithFrame:CGRectMake(0,0,self.view.frame.size.width, self.view.frame.size.height)];
for(int i = 0; i < nbView; i++) {
CGFloat xOrigin = i * self.view.frame.size.height;
UIView * vue = [[UIView alloc] initWithFrame:CGRectMake(0, xOrigin, self.view.frame.size.width, self.view.frame.size.height)];
vue.backgroundColor = [UIColor colorWithRed:0.5/i green:0.5 blue:0.5 alpha:1];
[scroll addSubview:vue];
[vue release];
}
scroll.contentSize = CGSizeMake(self.view.frame.size.width, self.view.frame.size.height * nbView);
[scroll setScrollEnabled:YES];
[self.view addSubview:scroll];
并且我定义了触发器：
-(void)scrollViewDidScroll:(UIScrollView *)scrollView {
NSLog(@"test");
}
当我运行应用程序时，我可以滚动，但永远不会调用scrollViewDidScroll 。
Hello I'm trying to trigger a function when the user is scrolling the app.
Here is my code
I defined a class MyViewController which implements the UIScrollViewDelegate
@interface CircleViewController : UIViewController <UIScrollViewDelegate> {
UIScrollView *scroll;
}
@property (retain, nonatomic) UIScrollView * scroll;
@end
Then, in the .m, in the ViewDidLoad I wrote :
- (void)viewDidLoad {
[super viewDidLoad];
self.scroll = [[UIScrollView alloc] init];
scroll.delegate = self;
[scroll setBackgroundColor:[UIColor whiteColor]];
NSInteger nbView = 3;
scroll = [[UIScrollView alloc] initWithFrame:CGRectMake(0,0,self.view.frame.size.width, self.view.frame.size.height)];
for(int i = 0; i < nbView; i++) {
CGFloat xOrigin = i * self.view.frame.size.height;
UIView * vue = [[UIView alloc] initWithFrame:CGRectMake(0, xOrigin, self.view.frame.size.width, self.view.frame.size.height)];
vue.backgroundColor = [UIColor colorWithRed:0.5/i green:0.5 blue:0.5 alpha:1];
[scroll addSubview:vue];
[vue release];
}
scroll.contentSize = CGSizeMake(self.view.frame.size.width, self.view.frame.size.height * nbView);
[scroll setScrollEnabled:YES];
[self.view addSubview:scroll];
And I define the trigger :
-(void)scrollViewDidScroll:(UIScrollView *)scrollView {
NSLog(@"test");
}
When I run the app, I am able to scroll, but the scrollViewDidScroll never gets called.
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您分配滚动视图两次可能是导致问题的原因......
您只需要分配一次，然后设置委托。
you are allocating the scroll view twice may be that what is causing the problem...
you just need to alloc it once and then set the delegate.