iPhone 'Development' Objective-C »Mobile

Objective-C: an alternative to the use of CGRectMake

Monday, July 27, 2009

CGRectMake() is a function (in reality an inline # define) used a lot especially when you create objects from code or graphical user interface. Its use is therefore often linked initialization components UIKit but also to simple UIView or UIImageView CGRectMake() returns a struct (structure type) CGRect

PLAIN TEXT
Objective-C:
  1. struct (CGRect
  2. CGPoint origin;
  3. CGSize size;
  4. );
  5. typedef struct CGRect CGRect;

Which in turn is composed of two different struct CGPoint and CGSize

PLAIN TEXT
Objective-C:
  1. struct (CGPoint
  2. CGFloat x;
  3. CGFloat y;
  4. );
  5. typedef struct CGPoint CGPoint;
  7. / * Sizes. * /
  9. struct (CGSize
  10. CGFloat width;
  11. CGFloat height;
  12. );
  13. typedef struct CGSize CGSize;

That, in turn, still contain the kinds CGFloat or type float If we analyze the code of CGRectMake () are:

PLAIN TEXT
Objective-C:
  1. CG_INLINE CGRect
  2. CGRectMake (CGFloat x, y CGFloat, CGFloat width, height CGFloat)
  3. (
  4. CGRect rect;
  5. y; rect.origin.x = x; rect.origin.y = y;
  6. height; rect.size.width = width; rect.size.height = height;
  7. return rect;
  8. )

It follows, therefore, that this part of code:

PLAIN TEXT
Objective-C:
  1. UIButton buttonWithType : UIButtonTypeRoundedRect ] ; UIButton * gbutton = [UIButton buttonWithType: UIButtonTypeRoundedRect];
  2. 12,409,100,40 ) ; gbutton.frame = CGRectMake (12,409,100,40);
  3. @ "Press" forState : UIControlStateNormal ] ; [Gbutton setTitle: @ "Press" Forst: UIControlStateNormal];
  4. gbutton ] ; [MainWindow addSubview: gbutton];

Could rightly be written as:

PLAIN TEXT
Objective-C:
  1. UIButton buttonWithType : UIButtonTypeRoundedRect ] ; UIButton * gbutton = [UIButton buttonWithType: UIButtonTypeRoundedRect];
  2. 12,409,100,40 } ; gbutton.frame = (CGRect) (12,409,100,40);
  3. @ "Press" forState : UIControlStateNormal ] ; [Gbutton setTitle: @ "Press" Forst: UIControlStateNormal];
  4. gbutton ] ; [MainWindow addSubview: gbutton];

Just to speed up a bit 'code execution ... :)

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2 comments to "Objective-C: an alternative to the use of CGRectMake"

  1. getAvatar 1.0
    July 27, 2009 Cristian:

    Curiosity ': if you want to learn Obj-C, say, from zero or nearly so, to which publications you can' pay?

    Reply Share
  2. getAvatar 1.0
    01 ago, 2009 Giovambattista Fazioli:

    @ Cristian: Google Book Search (Google Books), there are many resources (in English) is virtually complete.

    Reply Share

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