1//创建字符串2NSString *str1 = [NSStringstring];3//创建c字符串4NSString *str2 = [NSString stringWithCString:"ss"encoding:NSUTF8StringEncoding];5//用字符串创建字符串6NSString *str3 = [NSString stringWithString:@"dd"];7//创建nslog()格式的字符串8NSString *str4 = [NSString stringWith...