一句代码搞定UIbutton中的imageView和title的布局

先理解下面 (不理解也行,会调用就可以)

Button有两个属性:titleEdgeInsets和imageEdgeInsets,通过设置这两个,就可以实现所有需要的Button的样式,如:image在上、image在下、image在左、image在右。

titleEdgeInsets是titleLabel相对于其上下左右的inset,跟tableView的contentInset是类似的;

如果只有title,那titleLabel的上下左右都是相对于Button的;

如果只有image,那imageView的上下左右都是相对于Button的;

如果同时有image和label,那image的上下左相对于Button的,相对于label的;

label的上下右相对于Button的相对于label的。


写一个UIbutton的分类

.h文件

#importtypedef NS_ENUM(NSUInteger, MKButtonEdgeInsetsStyle) {

MKButtonEdgeInsetsStyleTop, // image在上,label在下

MKButtonEdgeInsetsStyleLeft, // image在左,label在右

MKButtonEdgeInsetsStyleBottom, // image在下,label在上

MKButtonEdgeInsetsStyleRight // image在右,label在左

};

@interface UIButton (ImageTitleSpacing)

/**

*  设置button的titleLabel和imageView的布局样式,及间距

*

*  @param style titleLabel和imageView的布局样式

*  @param space titleLabel和imageView的间距

*/

- (void)layoutButtonWithEdgeInsetsStyle:(MKButtonEdgeInsetsStyle)style

imageTitleSpace:(CGFloat)space;

@end

.m 文件

#import "UIButton+ImageTitleSpacing.h"

@implementation UIButton (ImageTitleSpacing)

- (void)layoutButtonWithEdgeInsetsStyle:(MKButtonEdgeInsetsStyle)style

imageTitleSpace:(CGFloat)space

{

//    self.backgroundColor = [UIColor cyanColor];

/**

*  前置知识点:titleEdgeInsets是title相对于其上下左右的inset,跟tableView的contentInset是类似的,

*  如果只有title,那它上下左右都是相对于button的,image也是一样;

*  如果同时有image和label,那这时候image的上左下是相对于button,右边是相对于label的;title的上右下是相对于button,左边是相对于image的。

*/

// 1. 得到imageView和titleLabel的宽、高

CGFloat imageWith = [UIDevice currentDevice].systemVersion.floatValue >= 8.0?self.imageView.intrinsicContentSize.width:self.imageView.frame.size.width;

CGFloat imageHeight = [UIDevice currentDevice].systemVersion.floatValue >= 8.0?self.imageView.intrinsicContentSize.height:self.imageView.frame.size.height;

CGFloat labelWidth = 0.0;

CGFloat labelHeight = 0.0;

if ([UIDevice currentDevice].systemVersion.floatValue >= 8.0) {

// 由于iOS8中titleLabel的size为0,用下面的这种设置

labelWidth = self.titleLabel.intrinsicContentSize.width;

labelHeight = self.titleLabel.intrinsicContentSize.height;

} else {

labelWidth = self.titleLabel.frame.size.width;

labelHeight = self.titleLabel.frame.size.height;

}

// 2. 声明全局的imageEdgeInsets和labelEdgeInsets

UIEdgeInsets imageEdgeInsets = UIEdgeInsetsZero;

UIEdgeInsets labelEdgeInsets = UIEdgeInsetsZero;

// 3. 根据style和space得到imageEdgeInsets和labelEdgeInsets的值

switch (style) {

case MKButtonEdgeInsetsStyleTop:

{

imageEdgeInsets = UIEdgeInsetsMake(-labelHeight-space/2.0, 0, 0, -labelWidth);

labelEdgeInsets = UIEdgeInsetsMake(0, -imageWith, -imageHeight-space/2.0, 0);

}

break;

case MKButtonEdgeInsetsStyleLeft:

{

imageEdgeInsets = UIEdgeInsetsMake(0, -space/2.0, 0, space/2.0);

labelEdgeInsets = UIEdgeInsetsMake(0, space/2.0, 0, -space/2.0);

}

break;

case MKButtonEdgeInsetsStyleBottom:

{

imageEdgeInsets = UIEdgeInsetsMake(0, 0, -labelHeight-space/2.0, -labelWidth);

labelEdgeInsets = UIEdgeInsetsMake(-imageHeight-space/2.0, -imageWith, 0, 0);

}

break;

case MKButtonEdgeInsetsStyleRight:

{

imageEdgeInsets = UIEdgeInsetsMake(0, labelWidth+space/2.0, 0, -labelWidth-space/2.0);

labelEdgeInsets = UIEdgeInsetsMake(0, -imageWith-space/2.0, 0, imageWith+space/2.0);

}

break;

default:

break;

}

// 4. 赋值

self.titleEdgeInsets = labelEdgeInsets;

self.imageEdgeInsets = imageEdgeInsets;

}

@end 

调用的话就很简单了,以图片在上,title在下为例子

MKButtonEdgeInsetsStyleTop, // image在上,label在下

MKButtonEdgeInsetsStyleLeft, // image在左,label在右

MKButtonEdgeInsetsStyleBottom, // image在下,label在上

MKButtonEdgeInsetsStyleRight // image在右,label在左

调用:

CGRect frame = CGRectMake(x, y, width, height);

UIButton *button = [[UIButton alloc] initWithFrame:frame];

[button layoutButtonWithEdgeInsetsStyle:MKButtonEdgeInsetsStyleTop imageTitleSpace:1.0];

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