Can any one please explain what is use of CGRectZero

Question

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

This is an example of how it can be used : http://stackoverflow.com/questions/13905144/using-autoresizingmask-with-cgrectzero — The Tom, Mar 06 '14 at 07:41

arturdev · Accepted Answer · 2017-07-26T06:38:24.533

18

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

For example:

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

From Apple's doc:

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

CG_EXTERN const CGRect CGRectZero
  CG_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);

edited Jul 26 '17 at 06:38

answered Mar 06 '14 at 07:40

arturdev

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Typo in your answer, CFRectZero should be CGRectZero. – Wayne Jul 25 '17 at 15:19
@Wayne nice catch :) – arturdev Jul 26 '17 at 06:38

score 2 · Answer 2 · answered Mar 06 '14 at 07:40

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CGRectZero = CGRectMake(0, 0, 0, 0);

answered Mar 06 '14 at 07:40

Rajesh

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score 2 · Answer 3 · answered Mar 06 '14 at 07:47

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CGRectZero

A rectangle constant with location (0,0), and width and height of 0. The zero rectangle is equivalent to CGRectMake(0,0,0,0).

Available in OS X v10.0 and later.

Declared in CGGeometry.h.

more details Geometric Zeros

answered Mar 06 '14 at 07:47

codercat

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score 1 · Answer 4 · answered Mar 06 '14 at 07:46

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The use of CGRectZero is to create and initialize a CGRect at (0,0,0,0)

answered Mar 06 '14 at 07:46

KmoSkillz

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score 0 · Answer 5 · answered Nov 28 '17 at 09:01

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Swift 4.0 -

A rectangle constant with location (0,0), and width and height of 0. The zero rectangle is equivalent to CGRectMake(0,0,0,0).

CGRect.zero  == CGRect(x: 0, y: 0, width: 0, height: 0)

Doc

answered Nov 28 '17 at 09:01

Jack

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Can any one please explain what is use of CGRectZero

5 Answers5

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