objective-c（框架）

框架指objective-c的foundation库，下面的例子中给出几个常见用的类及其方法。

• 数值对象

        NSNumber *intNum;
        NSNumber *longNum;
        NSNumber *floatNum;

        intNum = [NSNumber numberWithInteger:12];
        NSLog(@"%i", [intNum integerValue]);

        longNum = [NSNumber numberWithLong:0x123456];
        NSLog(@"%lx", [longNum longLongValue]);

        floatNum = [NSNumber numberWithFloat:12.00];
        NSLog(@"%f", [floatNum floatValue]);

        if([intNum isEqualToNumber:floatNum] == YES){
            NSLog(@"eqaul"); //相同
        }else{
            NSLog(@"not equal");
        } 

• 字符串

        NSString *str1 = @"hello,world";
        NSString *str2 = [NSString stringWithFormat:@"%i,%@", 5, @"fredric"];
        NSLog(@"%@%@", str1,str2);
        NSLog([str1 stringByAppendingString:str2]);

        NSMutableString *str3 = [NSMutableString stringWithString:@"hello"];
        [str3 appendString:@"fredric_"];
        [str3 insertString:@"word" atIndex:str3.length];
        NSLog(@"%@",str3); //hellofredric_word

        NSRange res = [str3 rangeOfString:@"ric"];
        if(res.location != NSNotFound){
            [str3 deleteCharactersInRange:res];
        }

        NSLog(@"%@",str3); //hellofred_word

• 数组

       NSArray *array = [NSArray arrayWithObjects:@"demo1",@"demo2",@"demo3", nil];

        for(int i = 0; i < [array count]; i++){
            NSLog(@"%@",[array objectAtIndex:i]);
        }

        NSMutableArray *mArray = [NSMutableArray arrayWithCapacity:3];
        [mArray addObject:@"demo4"];
        [mArray addObject:@"demo5"];
        [mArray addObject:@"demo6"];

        for(int i = 0; i < [mArray count]; i++){
            NSLog(@"%@",[mArray objectAtIndex:i]);
        }

• 字典

        NSDictionary *dic = [NSDictionary dictionaryWithObjectsAndKeys:@"value1",@"key1",@"value2",@"key2",@"valu3", @"key3", nil];
        NSString *value1 = [dic objectForKey:@"key1"];
        NSLog(@"%@", value1);

        NSMutableDictionary *mDic = [[NSMutableDictionary alloc]init];
        [mDic setObject:@"value1_1" forKey:@"key1"];
        NSLog(@"%@", [mDic objectForKey:@"key1"]);