iOS 中byte数组转化成图片

如果是做 java 的可能对这个byte[] 和字符串之间的转化并不陌生.做 iOS 对于图片处理似乎已经习惯了 SDWebImage 了.或许我们更熟悉通过 URL 去加载一张图片.但是这次后台返回了一个这种东西.

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37, 20, -43, -116, 105, 85, -99, 41, 115, 69, -22, 124, -15, 62, -105, -30, 75, 116, -5, 20, -42, -6, -126, -59, -45, -53, -7, -116, 127, -31, 93, -33, -61, -81, 3, -22, 26, 126, -72, -102, -90, -87, 27, -37, 52, 42, -58, 40, 74, 100, -79, 35, 25, 39, 24, 28, 30, -103, -51, 122, -84, 19, 37, -60, 9, 52, 77, -71, 28, 100, 26, -110, -77, -115, 20, -99, -18, 117, -43, -52, 106, 78, 14, 9, 37, 125, -56, 38, -110, -27, 28, 121, 54, -23, 34, 99, -110, 101, -38, 115, -12, -57, -11, -86, 47, -83, -57, 27, -78, 58, 68, -84, -89, 4, 27, -104, -63, 7, -13, -83, 90, 77, -93, -48, 126, 85, -77, 79, -71, -64, -102, -22, 102, 68, 74, -8, -106, 116, 82, 66, -75, -78, -79, 81, -48, -74, -20, 103, -21, -114, 43, 82, -118, 40, 67, -112, 86, 86, -76, -51, 26, -85, -93, 21, 113, 4, -28, 48, 56, 35, -28, -94, -118, 24, -106, -29, -31, 38, 111, 15, 110, -112, -105, 38, 2, 73, 110, 115, -63, -85, -106, -124, -75, -100, 12, -60, -110, 99, 82, 73, -17, -59, 20, 81, -44, 58, 19, 84, 87, 22, -48, 93, -64, -48, 92, -63, 28, -48, -74, 55, 71, 42, 6, 83, -125, -111, -112, 125, -24, -94, -108, -66, 22, 56, -4, 72, -126, -45, 73, -45, 108, 37, 50, -39, -23, -10, -106, -14, 21, -38, 94, 24, 85, 9, 30, -103, 3, -89, 2, -82, 81, 69, 77, 47, -124, -86, -65, 16, 85, 8, 120, -41, 46, -128, -32, 24, 99, 98, 61, 78, 88, 103, -12, 31, -107, 20, 85, -78, 8, 96, 37, 124, 75, 118, -128, -112, -90, -35, 24, -88, -24, 78, 72, -49, -41, 0, 10, -43, -94, -118, 96, -62, -87, -39, 59, -67, -42, -94, 25, -104, -124, -72, 1, 65, 61, 7, -107, 25, -64, -4, 73, 63, -115, 20, 80, 34, 29, 35, -125, 124, -93, -18, -83, -45, -128, 59, 14, -107, -91, 69, 21, 48, -8, 80, -27, -72, 81, 69, 21, 66, 63, -1, -39]";
}

图片,这是什么👻. 看是个数组还是个字符串.当然是字符串这一点可以忽略.转化数组还是比较简单的. 下面看看怎么转化.

        // 获取图片字符串
        NSString *str = dict[@"img"];
        // 截取中间的字符串并转化成数组
        str = [str substringWithRange:NSMakeRange(1, str.length - 2)];
        NSArray *array= [str componentsSeparatedByString:@","];
        
        // 子线程中将数组转化成 image
        dispatch_queue_t queue = dispatch_get_global_queue(0, 0);
        dispatch_async(queue, ^{
            NSUInteger count = array.count;
            uint8_t *bytes = malloc(sizeof(*bytes) * count);
            NSUInteger i;
            for (i = 0; i < count; i++) {
                NSString *str = [array objectAtIndex:i];
                NSInteger byte = [str integerValue];
                bytes[i] = byte;
            }
            NSData *data = [NSData dataWithBytesNoCopy:bytes length:count freeWhenDone:YES];
            UIImage *image= [UIImage imageWithData:data];
            
            // 回到主线程更新图片
            [self performSelectorOnMainThread:@selector(verifyImage:) withObject:image waitUntilDone:NO];
        });```


> 解决方案参考stackOverflow:
http://stackoverflow.com/questions/11860830/byte-array-to-nsdata

最后编辑于：2017.12.06 00:09:58

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iOS 中byte数组转化成图片

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