UIButton Set ImageView Frame

We found that when setting a frame for the UIButton ImageView, the size of the image cannot be changed, the size is the size of the picture, and the position can be modified using the Imageedgeinsets property.

Principle: Modifying the UIButton ImageView frame will call Superview, UIButton-(void) layoutsubviews, and this layoutsubviews will invoke UIButton's

-(CGRect) Imagerectforcontentrect: (CGRect) Contentrect; method, which returns the size of the picture by default.

There are several ways to modify the ImageView frame, which I think of:

1. Rewrite-(CGRect) Imagerectforcontentrect: (CGRect) Contentrect;

2. Delete ImageView view, add new ImageView, control frame

3. Rewrite layoutsubviews

-(void) layoutsubviews

{

cgrect frame = self. ImageView . Frame ;

[super layoutsubviews];

Self. ImageView . Frame = frame;

}

4. Do not inherit UIButton, directly modify the default implementation of Layoutsubviews

void Layoutsubviewswithoutautosetimageviewframe (ID self, Sel Sel)

{

UIButton * btn = (uibutton*)self;

cgrect frame;

if (btn. ImageView )

    {

frame = btn. ImageView . Frame ;

    }

[btn performselector:@selector(oldlayoutsubviews)];

if (btn. ImageView )

    {

btn. ImageView . Frame = frame;

    }

}

void Replaceuibuttonlayoutsubviewsmethod ()

{

IMP layoutsubviewsimp = class_getmethodimplementation([UIButton class], @selector (layoutsubviews));

class_addmethod([uibutton class], @selector (oldlayoutsubviews), Layoutsubviewsimp, "v@:" );

class_replacemethod([uibutton class], @ Selector(layoutsubviews), (IMP) ( Layoutsubviewswithoutautosetimageviewframe), "v@:");

}

Welcome everyone to spend the problem, discuss together, progress together, thank you.