http://blog.csdn.net/xutianyu930818/article/details/50788268

首先,我们放个正常的图片.这个图片应该是从百度地图sdk里取得

-(void)build  {      self.view.backgroundColor = [UIColor blackColor];      MyButton *button = [[MyButton alloc] initWithFrame:CGRectMake(55, 55, 100, 50)];      [button setTitle:@"测试" forState:UIControlStateNormal];      UIImage *buttonImage = [UIImage imageNamed:@"dizhi"];            [button setImage:buttonImage forState:UIControlStateNormal];      [self.view addSubview:button];  }

改变图片颜色代码

//  //  UIImage+Developer.m  //  Test  //  //  Created by XuTianyu on 16/3/3.  //  Copyright © 2016年 lakala. All rights reserved.  //    #import "UIImage+Developer.h"    @implementation UIImage (Developer)  /**  *  重新绘制图片  *  *  @param color 填充色  *  *  @return UIImage  */  - (UIImage *)imageWithColor:(UIColor *)color  {      UIGraphicsBeginImageContextWithOptions(self.size, NO, self.scale);      CGContextRef context = UIGraphicsGetCurrentContext();      CGContextTranslateCTM(context, 0, self.size.height);      CGContextScaleCTM(context, 1.0, -1.0);      CGContextSetBlendMode(context, kCGBlendModeNormal);      CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);      CGContextClipToMask(context, rect, self.CGImage);      [color setFill];      CGContextFillRect(context, rect);      UIImage*newImage = UIGraphicsGetImageFromCurrentImageContext();      UIGraphicsEndImageContext();      return newImage;  }  @end

[button setImage:[buttonImage imageWithColor:[UIColor blueColor]]forState:UIControlStateNormal];