//返回裁剪区域图片

-(UIImage*)clicpViewWithRect:(CGRect)aRect { //arect 想要截图的区域

    CGFloat scale = [UIScreen mainScreen].scale;

    aRect.origin.x*= scale;

    aRect.origin.y*= scale;

    aRect.size.width*= scale;

    aRect.size.height*= scale;

    UIGraphicsBeginImageContextWithOptions(CGSizeMake(self.view.width, self.view.height), YES, scale);

    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];

    UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    CGImageRefimageRef = viewImage.CGImage;

    CGImageRef imageRefRect =CGImageCreateWithImageInRect(imageRef, aRect);

    UIImage*sendImage = [[UIImagealloc]initWithCGImage:imageRefRect];

    returnsendImage;

}