压缩图片的处理

- (void)viewDidLoad {
    [super viewDidLoad];

    self.view.backgroundColor = [UIColor greenColor];
    
    //图片
    UIImage *image = [UIImage imageNamed:@"myinformation_pic"];
    
    [self imageWithImageSimple:image scaledToSize:CGSizeMake(100, 100)];
}

//压缩图片

- (UIImage*)imageWithImageSimple:(UIImage*)image scaledToSize:(CGSize)newSize
{
    //开启图片上下文
    UIGraphicsBeginImageContext(newSize);
    
    //绘制图片
    [image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
    
    
    //取得当前图片上下文
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    
    //关闭图片上下文
    UIGraphicsEndPDFContext();
    
    return newImage;
    
}