IOS 圖片轉換二進制 二進制轉換為圖片

//類方法  圖片 轉換為二進制
+(NSData *)Image_TransForm_Data:(UIImage *)image
{
    NSData *imageData = UIImageJPEGRepresentation(image , 0.5);
    //幾乎是按0.5圖片大小就降到原來的一半 比如這里 24KB 降到11KB
    return imageData;
}
//調用方法舉例
-(void)viewWillAppear:(BOOL)animated
{
    [self Read_ImageData];
}
- (void)viewDidLoad
{
     nav_View=[[NavView alloc]init];
    [self.view addSubview: [nav_View NavView_Title:@"通告"]];
    [super viewDidLoad];
    [self Read_ImageData];
}
//以下方法 就是把一圖片壓縮成二進制 再轉換成圖片做顯示 效果 不錯
-(void)Read_ImageData
{
    UIImageView *imageView1=[[UIImageView alloc]initWithFrame:CGRectMake(0, 80, 200, 200)];
    imageView1.image=[UIImage imageNamed:@"cat_food.png"];
    [self.view addSubview:imageView1]; 
    
    UIImageView *imageView3=[[UIImageView alloc]initWithFrame:CGRectMake(0, 280, 200, 200)];
    imageView3.image=[UIImage imageWithData:[Function Image_TransForm_Data:imageView1.image] ];
    [self.view addSubview:imageView3];
    NSData *data = [NSData dataWithData:[Function Image_TransForm_Data:imageView1.image ]];
    [data writeToFile:[Function CreateTheFolder_From:Library_Cache FileHolderName:MyFolder FileName:@"pp111111.png"] atomically:YES];
}

效果圖：如下

能看到一點被壓縮質量的細節是不是 還好哈哈