Question

所以我有一个字典，它在所有100个位置存储数字0，但我想使用这些0来初始化没有图像的100个图像。稍后，当不同的数字替换存储的0（即1）时，图像将改变。我有以下代码，这些代码一直有效，直到最后一行：

NSMutableDictionary *myDict = [[NSMutableDictionary alloc] init];

for (int i = 1; i <= 100; i ++) {
    if(myDict)
    {
        [myDict setObject:[NSNumber numberWithInt:0] forKey:[NSString stringWithFormat:@"block%.3istored",i]];
    }
}
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentPath = [paths objectAtIndex:0];
NSString *path = [documentPath stringByAppendingPathComponent:@"blocks.save"];
BOOL successfulWrite = [myDict writeToFile: path atomically: YES];
if(successfulWrite == NO);

[myDict setObject:[NSNumber numberWithInt:1] forKey:@"block002stored"];

for (int z = 1; z <= 100; z ++) {

    NSString *mapblock=@"mapblock";
    NSString *blocktocheck=[mapblock stringByAppendingFormat:@"%d",z];

    NSLog(@"%d", z);
    NSLog(@"%@", blocktocheck);

    {if (forKey:@"block%.3zstored" == 0) [@"%@", blocktocheck].image = [[UIImage imageNamed:@""];

}

任何帮助都将不胜感激。

Answer 1

2件事。

您错过了要发送支票的对象...＆gt;＆gt; if（forKey：@“block ....
您需要设置有效密钥＆gt;＆gt; @ “块％.3zstored”

将其更改为

for (int z = 1; z <= 100; z ++) {
    NSString *mapblock=@"mapblock";
    NSString *blocktocheck=[mapblock stringByAppendingFormat:@"%d",z];
    id key = blocktocheck;

    if ([myDict objectForKey:key] == nil) {
         [myDict setObject:img forKey:key];
     }
 }

使用If语句初始化图像

1 个答案: