dic=@{@"xian":@[@"a",@"b",@"c"],@"hangzhou":@[@"d",@"e",@"f"],@"wuhan":@[@"g",@"h",@"z"]};

NSString *path=[[NSBundlemainBundle]pathForResource:@"cities"ofType:@"plist"];

arry1=[[NSMutableArrayalloc]initWithContentsOfFile:path];

NSLog(@"%@",arry1);

leftarry=[[NSMutableArrayalloc]initWithArray:[dicallKeys

rightarry=[[NSMutableArrayalloc]init];

arry=[[NSMutableArrayalloc]initWithObjects:@"nihao",@"hahah",@"huhuh" ,nil];

mypickerview=[[UIPickerViewalloc]initWithFrame:CGRectMake(0, 100, self.view.frame.size.width  , 200)];

mypickerview.delegate=self;

mypickerview.dataSource=self;

//當前的顯示行與列

    [mypickerview

    [self.viewaddSubview:mypickerview];

//重新載入

   [pickerView reloadComponent:1];

}

// returns the number of 'columns' to display.

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{

return2;

}

// returns the # of rows in each component..

- (NSInteger

if (component==0) {

returnleftarry.count;

    }else{

returnrightarry.count;

    }

}

//在某一列選完某行之後所產生的響應

-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{

NSLog(@"com%ld row%ld",(long)component,(long)row);

if (component==0) {

rightarry=[dicobjectForKey:leftarry[row]];

NSLog(@"%@",rightarry);

        [pickerView reloadComponent:1];

    }

}

//顯示字型

-(NSString*)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{

if (component==0) {

return [[dicallKeys] objectAtIndex:row];

    }else {

returnrightarry[row];

    }

}

//帶屬性的字型

//-(NSAttributedString *)pickerView:(UIPickerView *)pickerView attributedTitleForRow:(NSInteger)row forComponent:(NSInteger)component{ 

//    NSString *[email protected]"hahahhahha";

//    NSMutableAttributedString *str=[[NSMutableAttributedString alloc]initWithString:string];

//    [str addAttribute:NSForegroundColorAttributeName value:[UIColor cyanColor] range:NSMakeRange(0, 2)];

//    return str;

//}

////顯示一個view

//-(UIView*)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view{

//    UILabel *mylabel=[[UILabel alloc]initWithFrame:CGRectMake(0, 0, 100, 20)];

//    [email protected]"hahah";

//    mylabel.backgroundColor=[UIColor cyanColor];

//    mylabel.layer.cornerRadius=5;

//    mylabel.layer.masksToBounds=YES;

//    return mylabel;

//}

//