将string字符串转换为array数组
NSArray *array = [str componentsSeparatedByString:@","];--分隔符
将array数组转换为string字符串
NSString *str = [array componentsJoinedByString:@","];--分隔符
将string字符串转换为array数组
NSArray *array = [str componentsSeparatedByString:@","];--分隔符
将array数组转换为string字符串
NSString *str = [array componentsJoinedByString:@","];--分隔符
本文标题：swift 字符串切割
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