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：

#import <UIKit/UIKit.h>

@interface UIButton_ImageAndTitle : UIButton

// space是图片与标题之间的间隙
- (void)setImageAndTitleEdgeInsets:(float)space;

@end

方法实现：

#import "UIButton_ImageAndTitle.h"

@implementation UIButton_ImageAndTitle

- (void)setImageAndTitleEdgeInsets:(float)space {
    CGSize imageSize = self.imageView.frame.size;
    CGSize titleSize = self.titleLabel.frame.size;
    CGFloat totalHeight = (imageSize.height + titleSize.height + space);
    
    self.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;
    
    [self setImageEdgeInsets:UIEdgeInsetsMake(- (totalHeight - imageSize.height), 0.0, 0.0, - titleSize.width)];
    [self setTitleEdgeInsets:UIEdgeInsetsMake(0.0, - imageSize.width, - (totalHeight - titleSize.height), 0.0*KSCALE_WIDTH)];
}

@end

用的时候很简单：

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

我这里的效果如下：