如何从tapped位置获取CGPoint？ [英] How to get a CGPoint from a tapped location?

问题描述

我正在为iPad制作一个图形计算器应用程序，我想添加一个功能，用户可以在图表视图中点击一个区域，弹出一个文本框，显示他们触摸的点的坐标。我如何从中获得CGPoint？

I'm working on a graphing calculator app for the iPad, and I wanted to add a feature where a user can tap an area in the graph view to make a text box pop up displaying the coordinate of the point they touched. How can I get a CGPoint from this?

推荐答案

你有两种方式......

you have two way ...

1.

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{
  UITouch *touch = [[event allTouches] anyObject];
  CGPoint location = [touch locationInView:touch.view];
}

在这里，您可以从当前视图获取点位置...

here,you can get location with point from current view...

2。

UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapped:)];
[tapRecognizer setNumberOfTapsRequired:1];
[tapRecognizer setDelegate:self];
[self.view addGestureRecognizer:tapRecognizer];

这里，当您想要对主视图的特定对象或子视图做某事时，此代码使用

here,this code use when you want to do somthing with your perticular object or subview of your mainview

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