摘要： 静态字符串NSStringNSString *hello = @"hello"; //声明NSString *append = [hello stringByAppendingString:@"world!"]; //追加NSString *format = [NSString stringWithFormat:@"1 + 1 = %i", 2]; //格式化NSString *helloStr = [[NSString alloc] initWithString:@"hello world"]; //分配内存并初 阅读全文