objective-c字符串鏈接的三種方式

NSString* result; // 結果字符串 NSString* string1, string2; //已存在的字符串spa 1. result = [NSString initWithFormat:@"%@,%@", string1, string2 ]; 2. result = [string1 stringByAppendingString:string2]; 3 . result

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