Objective-C 如何在一行上打印 NSSet(没有尾随逗号/空格) [英] Objective-C How to print NSSet on one line (no trailing comma / space)

问题描述

我试图在一行中打印出一个 NSSet，逗号分隔但没有尾随逗号或空格.我该怎么做?

Im trying to print out an NSSet on a single line, comma separation but no trailing comma or space. how can i do this?

我知道这适用于数组:

    NSMutableString *outputStringArray = [[NSMutableString alloc] init];
    NSMutableArray *myArray = [[NSMutableArray alloc] initWithCapacity:10];

    for (int k = 0; k < [myArray count]; k++) {
        [outputStringArray appendFormat:@"%@, ", [myArray objectAtIndex:k]];
    }
    NSLog(@"%@", [outputStringArray substringToIndex:[outputStringArray length] - 2]);

但是由于集合没有索引，我不能这样做.

but since sets don't have indexing i cant do this.

谢谢

推荐答案

你总是可以从一个集合中创建一个数组，像这样:

You can always make an array out of a set, like this:

NSArray *myArray = [mySet allObjects];

之后，您可以使用 componentsJoinedByString::

NSString *str = [myArray componentsJoinedByString:@", "];

当然，您可以使用类似于您帖子中的循环的简单循环来实现相同的效果:

Of course you can achieve the same effect with a simple loop similar to the one in your post:

BOOL isFirst = YES;
for (id element in mySet) {
    if (!isFirst) {
        [outputStringArray appendString:@", "];
    } else {
        isFirst = NO;
    }
    [outputStringArray appendFormat:@"%@", element];
}

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