加入一串字符串

Created: November-22, 2018

将 NSArray 的 NSArray 组合成一个新的 NSString：

NSArray *yourWords = @[@"Objective-C", @"is", @"just", @"awesome"];
NSString *sentence = [yourWords componentsJoinedByString:@" "];

// Sentence is now: @"Objective-C is just awesome"