字典可变

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
//可变字典创建
        NSMutableDictionary *mudic=[[NSMutableDictionary alloc]initWithObjectsAndKeys:@"jay",@"name",@"22",@"age",@"F",@"gender", nil];
    //插入
        NSDictionary *dic=[NSDictionary dictionaryWithObject:@"166" forKey:@"height"];
        [mudic addEntriesFromDictionary:dic];
        [mudic setValue:@"66" forKey:@"weight"];
        NSLog(@"%@",mudic);
    //创建新的字典，向空字典赋值
        NSMutableDictionary *newdic=[NSMutableDictionary dictionary];
        [newdic setDictionary:mudic];
        NSMutableDictionary *newdic1=[NSMutableDictionary dictionary];
        [newdic1 setDictionary:mudic];
        NSLog(@"%@",newdic);
    //将字典中对应key值删除(1)
        [newdic removeObjectForKey:@"weight"];
        NSLog(@"%@",newdic);
    //(2)利用数组
        NSArray *keys=[NSArray arrayWithObjects:@"height",@"gender", nil];
        [newdic removeObjectsForKeys:keys];
        NSLog(@"%@",newdic);
    //全部删除
        [newdic removeAllObjects];
        NSLog(@"%@",newdic);
//遍历
//先找到所有key值，计算key的个数，用以循环遍历条件；通过key的数组找到对应key的值
        NSArray *keyss=[newdic1 allKeys];
        //NSInteger count=[keyss count];
        for (int i=0; i<keyss.count; i++) {
            id key=[keyss objectAtIndex:i];//对应位置
            NSLog(@"%@",[newdic1 objectForKey:key]);
        }
//快速枚举
        for (id key in newdic1) {
            id obj=[newdic1 objectForKey:key];
            NSLog(@"%@",obj);
        }
//枚举对象 通过枚举对象进行枚举遍历
//1.将字典里的key转成枚举对象，用于遍历(1)
        NSEnumerator *keyenum=[newdic keyEnumerator];
        id key;
        while (key=[keyenum nextObject]) {//从key中取值
            id obj=[newdic objectForKey:key];
            NSLog(@"%@",obj);

        }
    //(2)
        NSEnumerator *keyenum1=[newdic keyEnumerator];
        id key1=[keyenum1 nextObject];
        while (key1) {//从key中取值
            id obj1=[newdic objectForKey:key];
            NSLog(@"%@",obj1);
            key1=[keyenum1 nextObject];
        }
        
        
    }
    return 0;
}