选择器UIPickerView

1. //UIPickerView创建
2.   UIPickerView *cityPick = [[UIPickerViewalloc] initWithFrame:CGRectMake(0,44, 320, 200)];
3.     cityPick.dataSource =self;
4.     cityPick.delegate =self;
5.     cityPick.backgroundColor=[UIColorcolorWithRed:226.0/255.0green:226.0/255.0blue:226.0/255.0alpha:1];
6.     cityPick.showsSelectionIndicator =YES;
7.     cityPick.hidden =NO;
8.     [pickerBgaddSubview:cityPick];

//调用代理方法类似UITableView

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component

{

    returncityArray.count;

}

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView

{

   return 1;

}

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

{

    

    return [[cityArrayobjectAtIndex:row] objectAtIndex:1];

}

//点击某一行

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

{

    didSelectRow = row;

    _cityName = [[cityArrayobjectAtIndex:row] objectAtIndex:1];

    NSLog(@"%d",didSelectRow);

}