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:];
     for (int i=; i<; i++) {
      [marray addObject: [NSString stringWithFormat:@"%dhaha",i]];
     }
 //    删除后二十个元素第一种方法
     for (int i=; i<; 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:];
     for (int i=; i<; i++) {
         [key1 addObject: [NSString stringWithFormat:@"%d",i]];
     }
     NSMutableArray *value1 = [NSMutableArray arrayWithCapacity:];
     for (int i=; i<; i++) {
         [value1 addObject: [NSString stringWithFormat:@"%d",i+]];
     }
 //    创建可变字典
     NSMutableDictionary *mdic = [NSMutableDictionary dictionaryWithCapacity:];
 //    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=; i<; i++) {
         [mdic setValue:[value1 objectAtIndex:i] forKey:[key1 objectAtIndex:i]];
     }

     NSLog(@"jjj%@",mdic);