第51月第8天 nsdata分割

1.

#define A_RECEIVE 1000
    NSData *imageData = UIImageJPEGRepresentation([UIImage imageNamed:@"xxx.jpg"], 1);
    NSMutableArray *imageDataArray = [[NSMutableArray alloc] init];
    for (int i = 0; i<= [imageData length]-A_RECEIVE; i+=A_RECEIVE) {
        lastIValue = i+A_RECEIVE;
        NSString *rangeStr = [NSString stringWithFormat:@"%i,%i",i,A_RECEIVE];
        NSData *subData = [imageData subdataWithRange:NSRangeFromString(rangeStr)];
        [imageDataArray addObject:subData];
    }
 
    NSString *rangeStr = [NSString stringWithFormat:@"%i,%i",lastIValue,[imageData length]%A_RECEIVE];
    NSData *subData = [imageData subdataWithRange:NSRangeFromString(rangeStr)];
    [imageDataArray addObject:subData];
     
    NSMutableData *newData = [[NSMutableData alloc] init];
    for (int i = 0; i< [imageDataArray count]; i++) {
        [newData appendData:[imageDataArray objectAtIndex:i]];
    }
    [imageDataArray release];
     
    UIImage *newImage = [[UIImage alloc] initWithData:newData];
    [newData release];
    [testImage setImage:newImage];
    [newImage release];

https://www.cnblogs.com/zhwl/archive/2013/01/05/2845183.html