谁能解释一下CGRectZero的用途 [英] Can any one please explain what is use of CGRectZero

问题描述

我是iOS的新手.谁能解释一下CGRectZero的用途是什么?

I am new to iOS. Can any one please explain what the use is of CGRectZero and where it is used?

推荐答案

CGRectZero等于CGRectMake(0,0,0,0).通常，它用于快速初始化CGRect对象.

CGRectZero equals to CGRectMake(0,0,0,0). Usually it's used to fast-initialize CGRect object.

例如:

CGRect frame = CGRectZero;
frame.size.width = someWidth;
frame.size.height = someHeight;
myView.frame = frame;

摘自Apple文档:

/* The "zero" rectangle -- equivalent to CGRectMake(0, 0, 0, 0). */ 

CG_EXTERN const CGRect CGRectZero
  CG_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);

这篇关于谁能解释一下CGRectZero的用途的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！