参考：http://blog.csdn.net/qijianli/article/details/8152726

不过有个问题，就是我使用时不能改变文字的颜色，后来修改了一下方法，如下：

定义一个UIButton+Manager文件，在.h

#import <UIKit/UIKit.h>

@interface UIButton (UIButtonImageWithLable)
- (void) setImage:(UIImage *)image withTitle:(NSString *)title forState:(UIControlState)stateType;
@end

#import "UIButton+Manager.h"

@implementation UIButton (UIButtonImageWithLable)
- (void) setImage:(UIImage *)image withTitle:(NSString *)title forState:(UIControlState)stateType {
    //UIEdgeInsetsMake(CGFloat top, CGFloat left, CGFloat bottom, CGFloat right)
    
    CGSize titleSize = [title sizeWithFont:[UIFont systemFontOfSize:12.0]];
    [self.imageView setContentMode:UIViewContentModeCenter];
    [self setImageEdgeInsets:UIEdgeInsetsMake(-8.0,
                                              0.0,
                                              0.0,
                                              -titleSize.width)];
    [self setImage:image forState:stateType];
    
    
    
    [self.titleLabel setContentMode:UIViewContentModeCenter];
    [self.titleLabel setBackgroundColor:[UIColor clearColor]];
    [self.titleLabel setFont:[UIFont systemFontOfSize:12.0]];
    [self setTitleColor:[UIColor blueColor] forState:stateType];//用这个方法替换下面的方法，文字的颜色就可以显示了。
    //[self.titleLabel setTextColor:[UIColor blueColor]];
    if (stateType == UIControlStateSelected) {
        [self setTitleColor:[UIColor blueColor] forState:UIControlStateSelected];
    }else{
        [self setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    }
    
    [self setTitleEdgeInsets:UIEdgeInsetsMake(35.0,
                                              -image.size.width,
                                              0.0,
                                              0.0)];
    [self setTitle:title forState:stateType];
    
}

@end