string 如何将 NSArray 元素连接到 NSString 中？
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How to join NSArray elements into an NSString?
提问by Dave DeLong
Given an NSArray of NSStrings, is there a quick way to join them together into a single NSString (with a Separator)?
给定一个 NSString 的 NSArray，是否有一种快速的方法将它们连接到一个 NSString（带有分隔符）中？
回答by Dave DeLong
NSArray * stuff = /* ... */;
NSString * combinedStuff = [stuff componentsJoinedByString:@"separator"];
This is the inverse of -[NSString componentsSeparatedByString:].
这是 的倒数-[NSString componentsSeparatedByString:]。
回答by BJ Homer
-componentsJoinedByString:on NSArray should do the trick.
-componentsJoinedByString:在 NSArray 上应该可以解决问题。
回答by Ben G
There's also this variant, if your original array contains Key-Value objects from which you only want to pick one property (that can be serialized as a string ):
还有这个变体，如果您的原始数组包含您只想从中选择一个属性的键值对象（可以序列化为字符串）：
@implementation NSArray (itertools)
-(NSMutableString *)stringByJoiningOnProperty:(NSString *)property separator:(NSString *)separator
{
NSMutableString *res = [@"" mutableCopy];
BOOL firstTime = YES;
for (NSObject *obj in self)
{
if (!firstTime) {
[res appendString:separator];
}
else{
firstTime = NO;
}
id val = [obj valueForKey:property];
if ([val isKindOfClass:[NSString class]])
{
[res appendString:val];
}
else
{
[res appendString:[val stringValue]];
}
}
return res;
}
@end
