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NSString *filePath = [documentsDirectory stringByAppendingPathComponent:@"xxx.txt"]; https://www.cnblogs.com/FBiOSBlog/p/5819418.html https://blog.csd 阅读全文
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NSString* str=@"hello";//存在代码区,不可变 NSLog(@"%@",str); //1.【字符串插入】 NSMutableString* str1=[[NSMutableStringalloc]initWithString:@"hello"];//存在堆区,可变字符串 NSLog(@"str... 阅读全文