将字符串存储为逗号分隔值

Question

我按如下方式迭代 NSDictionary，如果它包含字符串 http，则将值分配给字符串。

for(id key in photos){

                     //NSLog(@"key=%@ value=%@", key, [photos objectForKey:key]);
    if ([[[photos objectForKey:key] stringByAppendingString: key] containsString:@"http"]){
    photoUrl = [[photos objectForKey:key] stringByAppendingString: key];
                     }
    NSLog(@"etf %@",photoUrl);

 }

如何创建逗号分隔 url 并将其分配给 photoUrl。例如，一个 nsdictionary 可能包含多个 urls 所以我想将所有 urls 连接为逗号分隔值并稍后将其分配给 photoUrl?
以后如何检索这些逗号分隔值？

Answer 1

如果你从某个数组中获取

NSString *joinedComponents = [array componentsJoinedByString:@","];

否则你可以遍历你自己的一些 collection

NSMutableString * string1 = [[NSMutableString alloc] initWithString:@"this is my string"];

[string1 appendString:@" with more strings attached"];

同样你可以稍后将它们分开

NSArray *items = [string1 componentsSeparatedByString:@","];

将键值保存在字符串中，使你的url.

Answer 2

在循环中创建一个数组，

NSArray *urls = [NSMutableArray array];
for (id key in photos) {
  NSString *photoUrl = [[photos[key] stringByAppendingString: key]
  if (photoUrl containsString:@"http"]){
    urls appendItem[photoUrl];
  }
}

然后您可以使用

创建一个 CSV 字符串

NSString *csvUrls = [urls componentsJoinedByString:@","];

然后用

分解它

NSArray *urls = [csvUrls componentsSeparatedByString:@","];

将字符串存储为逗号分隔值

Storing String as a comma separated values

objective-c

nsdictionary

nsstring

ios