NSString和NSMutableString的基本用法
2015-04-22 19:47
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int main(int argc, const char * argv[]) { @autoreleasepool { //----------------NSString----------------------------- NSString *str1 = @"这是一个字符串常量"; NSLog(@"str1 = %@",str1); //创建一个空字符串 NSString *str2 = [[NSString alloc]init]; NSString *str3 = [NSString string]; NSLog(@"str2 = %@",str2); NSLog(@"str3 = %@",str3); //快速创建一个字符串 NSString *str4 = [[NSString alloc]initWithString:str1]; NSString *str5 = [NSString stringWithString:str1]; NSLog(@"str4 = %@",str4); NSLog(@"str5 = %@",str5); //创建一个格式化字符串 NSString *str6 = [[NSString alloc]initWithFormat:@"%d",10]; NSString *str7 = [NSString stringWithFormat:@"%.2f",10.8099887]; NSLog(@"str6 = %@",str6); NSLog(@"str7 = %@",str7); //比较两个字符串内容是否相等 if ([str6 isEqualToString:str7]) { NSLog(@"str6 is EqualToString str7"); }else{ NSLog(@"str6 is not EqualToString str7"); } //转换为基本数据类型 NSString *str8 = @"3"; float f1 = [str8 floatValue]; NSLog(@"str8 = %.2f",f1); //字符串拆分为数组 NSString *str9 = @"命 运 就 算 颠 沛 流 离"; NSArray *array = [str9 componentsSeparatedByString:@" "]; NSLog(@"array = %@",array); NSLog(@"array[0] = %@",array[0]); //截取字符串 NSString *str10 = @"123456789"; NSString *subStr1 = [str10 substringToIndex:4]; NSString *subStr2 = [str10 substringFromIndex:6]; NSLog(@"subStr1 = %@",subStr1); NSLog(@"subStr2 = %@",subStr2); NSRange range = {4,2}; NSString *subStr3 = [str10 substringWithRange:range]; NSLog(@"subStr3 = %@",subStr3); //拼接字符串 NSString *str11 = @"123"; NSString *str12 = @"456"; NSString *appStr1 = [[NSString alloc]initWithFormat:@"%@%@",str11,str12]; NSString *appStr2 = [str11 stringByAppendingFormat:@"%@",str12]; NSString *appStr3 = [str11 stringByAppendingString:str12]; NSLog(@"appStr1 = %@",appStr1); NSLog(@"appStr2 = %@",appStr2); NSLog(@"appStr3 = %@",appStr3); //查找字符串 NSString *str13 = @"qweradsfzxcvqazxsw"; NSRange range1 = [str13 rangeOfString:@"dsfzx"]; NSLog(@"%@",NSStringFromRange(range1)); NSLog(@"%d",range1.location); if (range1.location != NSNotFound) { NSLog(@"str found"); }else{ NSLog(@"str not found"); } /*------------NSMutableString 可变字符串-----------------*/ //插入 NSMutableString *mStr1 = [[NSMutableString alloc] initWithFormat:@"abcd"]; [mStr1 insertString:@"defg" atIndex:4]; //注意:此处为在源字符串上修改,并未生成新的字符串 NSLog(@"mStr1 = %@",mStr1); //替换 [mStr1 replaceCharactersInRange:NSMakeRange(4, 4) withString:@"1234"]; NSLog(@"%@",mStr1); //删除 [mStr1 deleteCharactersInRange:NSMakeRange(4, 4)]; NSLog(@"%@",mStr1); } return 0; }
凡是用不可变字符串可以解决的一般不用可变的 因为可变字符串占用更多的内存
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