IOS开发－OC学习－Foundation框架练习

OC语言Foundation框架中字典、字符串、数组的应用：

 

NSString *string = @"China|Usa|France";
    
    NSArray *array = [string componentsSeparatedByString:@"|"];
    NSLog(@"%@",array);
    
    NSMutableArray *marray = [NSMutableArray arrayWithCapacity:100];
    for (int i=0; i<100; i++) {
     [marray addObject: [NSString stringWithFormat:@"%dhaha",i]];
    }
//    删除后二十个元素第一种方法
    for (int i=0; i<20; i++) {
        [marray removeLastObject];
    }
    
//    删除后二十个元素第二种方法
//    [marray removeObjectsInRange:NSMakeRange(80, 20)];
    NSLog(@"%@",marray);
    
    
//  创建一个字典，key值从0到10，value值从100到110
//     先创建两个数组key1和value1
    NSMutableArray *key1 = [NSMutableArray arrayWithCapacity:11];
    for (int i=0; i<11; i++) {
        [key1 addObject: [NSString stringWithFormat:@"%d",i]];
    }
    NSMutableArray *value1 = [NSMutableArray arrayWithCapacity:11];
    for (int i=0; i<11; i++) {
        [value1 addObject: [NSString stringWithFormat:@"%d",i+100]];
    }
//    创建可变字典
    NSMutableDictionary *mdic = [NSMutableDictionary dictionaryWithCapacity:11];
//    循环给字典添加键值对（键值对由上面代码创建的数组构成）
    for (int i=0; i<11; i++) {
        [mdic setValue:[value1 objectAtIndex:i] forKey:[key1 objectAtIndex:i]];
    }
    
    NSLog(@"jjj%@",mdic);