两张图片拼接为一张图片成为背景图片

/*

 1.trayImgView为要展示到的imageView（底部托盘）

 2.bigImg张为矩形全灰色（使用图片本身的尺寸）

 3.littleImg张为正方行带字（使用图片本身的尺寸）

 4.bigImg尺寸无所谓要、littleImg尺寸要相对于bigImg尺寸适当（看着好看！）

 功能：两张图片拼接为一张图片成为背景图片。bigImg随意拉伸，littleImg会变大小但是一直为正方形，字体不会被拉变形，只会变大变小

 */

#pragma mark -默认背景图片

-(UIImage *)defaultBgImage:(UIImageView *)trayImgView

{

//    NSLog(@"%f==%f",trayImgView.frame.size.width,trayImgView.frame.size.height);

    UIImage *bigImg =[UIImage imageNamed:@"defaultBg.png"];

    UIImage *littleImg =[UIImage imageNamed:@"defaultIcon.png"];

    return [self defaultImageView:trayImgView addImage:bigImg toImage:littleImg];

}

- (UIImage *)defaultImageView:(UIImageView *)trayImgView addImage:(UIImage *)image1 toImage:(UIImage *)image2 {

    UIGraphicsBeginImageContext(image1.size);

    

    // Draw image1

    [image1 drawInRect:CGRectMake(0, 0, image1.size.width, image1.size.height)];

    // Draw image2

    [image2 drawInRect:CGRectMake(image1.size.width/2-image2.size.width/2,

                                  image1.size.height/2-(image2.size.height*(trayImgView.frame.size.width/trayImgView.frame.size.height))/2,

                                  image2.size.width,

                                  image2.size.height*(trayImgView.frame.size.width/trayImgView.frame.size.height))];

    

    UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    

    return resultingImage;

}