设置UIButton上面是image，下面是title

此处写了一个UIButton的子类，添加了一个设置titleEdgeInsets和imageEdgeInsets

的方法，代码如下：

1 #import <UIKit/UIKit.h>
2 
3 @interface UIButton_ImageAndTitle : UIButton
4 
5 // space是图片与标题之间的间隙
6 - (void)setImageAndTitleEdgeInsets:(float)space;
7 
8 @end

方法实现：

 1 #import "UIButton_ImageAndTitle.h"
 2 
 3 @implementation UIButton_ImageAndTitle
 4 
 5 - (void)setImageAndTitleEdgeInsets:(float)space {
 6     CGSize imageSize = self.imageView.frame.size;
 7     CGSize titleSize = self.titleLabel.frame.size;
 8     CGFloat totalHeight = (imageSize.height + titleSize.height + space);
 9     
10     self.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;
11     
12     [self setImageEdgeInsets:UIEdgeInsetsMake(- (totalHeight - imageSize.height), 0.0, 0.0, - titleSize.width)];
13     [self setTitleEdgeInsets:UIEdgeInsetsMake(0.0, - imageSize.width, - (totalHeight - titleSize.height), 0.0*KSCALE_WIDTH)];
14 }
15 
16 @end

用的时候很简单：

1 self.btnFlash = [[UIButton_ImageAndTitle alloc] init];
2     _btnFlash.bounds = CGRectMake(0, 0, size.width, size.height);
3     _btnFlash.center = CGPointMake(CGRectGetWidth(_bottomItemsView.frame) * 3/4, CGRectGetHeight(_bottomItemsView.frame)/2);
4      [_btnFlash setImage:[UIImage imageNamed:@"CodeScan.bundle/scan_flash_default"] forState:UIControlStateNormal];
5     [_btnFlash setImage:[UIImage imageNamed:@"CodeScan.bundle/scan_flash_selected"] forState:UIControlStateSelected];
6     [_btnFlash setTitle:@"打开手电筒" forState:UIControlStateNormal];
7     [_btnFlash setImageAndTitleEdgeInsets:10*KSCALE_HEIGHT];
8     [_btnFlash addTarget:self action:@selector(openOrCloseFlash:) forControlEvents:UIControlEventTouchUpInside];

我这里的效果如下：