查找按钮的位置。 CGRectMake [英] Finding the position of a button. CGRectMake

问题描述

我有一个按钮，我使用 CGRectMake 将其放置如下：

I have a button and I'm using CGRectMake to position it like this:

btn5.frame = CGRectMake(211, 280, 109, 60);

我想 211 和 280 是按钮的坐标。

I guess 211 and 280 are the coordinates of the button. So how can I modify that code if I want the button to be near the bottom left corner.

推荐答案

是的，你是正确的。按钮的框架定义它在其父视图上的位置。因此，如果使用此代码， btn5 将位于位置（x = 211，y = 280），并且将具有尺寸（width = 109，hight = / p>

Yes, you are correct. The frame of the button defines where it is located on its parent view. So btn5 will be in the position (x = 211, y = 280) and will have the dimensions (width = 109, hight = 60) if you use this code:

btn5.frame = CGRectMake(211, 280, 109, 60);

一般表达式为：

btn5.frame = CGRectMake(buttonX, buttonY, buttonWidth, buttonHeight);

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如果要更改按钮的位置到左下角，你可以这样做：

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If you want to change the position of the button to the bottom left corner, you can do like this:

btn5.frame = CGRectMake(0, self.view.frame.size.height - 60, 109, 60);

如果要在按钮和角落之间添加一些空格，按钮：

If you want to add some space between the button and the corner, and also change the size of the button:

CGFloat x = leftPadding;
CGFloat y = self.frame.size.width - desiredHeight - bottomPadding;
btn5.frame = CGRectMake(x, y, desiredWidth, desiredHeight); 

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有关详细信息，请检查Apple的查看几何和坐标系指南。

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