如何获取UItextview触摸坐标位置
我需要通过触摸视图来获取坐标位置。我触摸的视图是UITextview。视图的层次结构是 UIViewController -> UITextview。我想我可以使用 locationInView 方法来获取该坐标。我知道 UITextview 有一些委托方法，所以我想我必须使用 textViewShouldBeginEditing 委托方法来调用 locatioInView。
这是我的代码片段，
-(BOOL)textViewShouldBeginEditing:(UITextView *)textView {
NSSet *touches;
UITouch *touch = [touches anyObject];
CGPoint currentTouchPosition = [touch locationInView:textView];
NSLog(@"currentTouchPosition: x=%f, y=%f", currentTouchPosition.x, currentTouchPosition.y);
return YES;
}
我的问题是，currentTouchPosition 在 x 和 y 中始终具有 0 值。我不知道该代码有什么问题。 有人可以告诉我吗？？？
谢谢
更新 最后我解决了这个问题。我在 viewDidLoad 中使用了 UITapGestureRecognizer，然后使用我在 textViewShouldBeginEditing 中使用的相同方法获取点击位置。这是我编写的代码：
- (void)viewDidLoad {
[super viewDidLoad];
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapFrom:)];
tap.delegate=self;
[self.textView addGestureRecognizer:tap];
tap.numberOfTapsRequired = 1;
[tap release];
}
这是handleTapFrom：
- (void)handleTapFrom:(UITapGestureRecognizer *)recognizer {
locationTap = [recognizer locationInView:self.textView];
}
i need to get the coordinate position from touching a view. The view i touch is UITextview. THe hierarchy of the view is UIViewController -> UITextview. I think i can use locationInView method to get that coordinate. I know that UITextview have some delegate methods, so i think i have to use textViewShouldBeginEditing delegate method to call the locatioInView.
This is my code snippet
-(BOOL)textViewShouldBeginEditing:(UITextView *)textView {
NSSet *touches;
UITouch *touch = [touches anyObject];
CGPoint currentTouchPosition = [touch locationInView:textView];
NSLog(@"currentTouchPosition: x=%f, y=%f", currentTouchPosition.x, currentTouchPosition.y);
return YES;
}
my problem is, the currentTouchPosition always have 0 value in x and y. I dont know what's wrong with that code.
Can somebody tell me???
thank you
UPDATE
Finally i've solved this problem. I have use UITapGestureRecognizer in viewDidLoad and then get the tap location using the same method i was use in textViewShouldBeginEditing. This is the code i've made :
- (void)viewDidLoad {
[super viewDidLoad];
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapFrom:)];
tap.delegate=self;
[self.textView addGestureRecognizer:tap];
tap.numberOfTapsRequired = 1;
[tap release];
}
and this is the handleTapFrom :
- (void)handleTapFrom:(UITapGestureRecognizer *)recognizer {
locationTap = [recognizer locationInView:self.textView];
}
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您只需声明一个 NSSet 对象并从中检索数据，该数据始终为空。
取一个 UITextView 的子类并在其中写下 touch begin 方法，即
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event。参数 Touches 将为您提供正确的触摸指向视图。使用您的子类对象作为您的 TextView。Your simply declaring one NSSet object and retrieving data from it which always gives eampty.
Take a subClass of UITextView and write down touch begin method in it i.e
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event.The parameter touches will then give you the correct touch point on the view.Use your subclass object as your TextView.