uipicker对省市的遍历

时间：2016-03-18 21:29:33 阅读：193 评论：0 收藏：0 [点我收藏+]

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1、首先，对UIPickerView绑定Delegate和DataSource到相应的ViewController。此处不再赘述。可以用代码或者Interface界面设置。

2、首先实现数据的初始化。

（1）在.h文件中定义如下变量。其中provinces_cities.plist请见附件。

Cpp代码

（2）在.m的viewDidLoad方法中加上初始化数据的处理。具体处理在initPicker方法

Cpp代码

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self initPicker];
}
//初始化PickerView使用的数据源
-(void)initPicker{
NSBundle *bundle = [NSBundle mainBundle];
NSString *plistPath = [bundle pathForResource:@"provinces_cities" ofType:@"plist"];
dict = [[NSDictionary alloc] initWithContentsOfFile:plistPath];
provinceArray = [dict allKeys];
NSInteger selectedProvinceIndex = [self.pickerView selectedRowInComponent:0];
NSString *seletedProvince = [provinceArray objectAtIndex:selectedProvinceIndex];
cityArray = [dict objectForKey:seletedProvince];
NSLog(@"%d",[provinceArray count]);
}

3、将数据绑定到UIPickerView

Cpp代码

4.随时监听UIPickerView的滚动。

Cpp代码

//监听轮子的移动
- (void)pickerView:(UIPickerView *)pickerView
didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
if (component == 0) {
NSString *seletedProvince = [provinceArray objectAtIndex:row];
cityArray = [dict objectForKey:seletedProvince];
//重点！更新第二个轮子的数据
[self.pickerView reloadComponent:1];
NSInteger selectedCityIndex = [self.pickerView selectedRowInComponent:1];
NSString *seletedCity = [cityArray objectAtIndex:selectedCityIndex];
NSString *msg = [NSString stringWithFormat:@"province=%@,city=%@", seletedProvince,seletedCity];
NSLog(@"%@",msg);
}
else {
NSInteger selectedProvinceIndex = [self.pickerView selectedRowInComponent:0];
NSString *seletedProvince = [provinceArray objectAtIndex:selectedProvinceIndex];
NSString *seletedCity = [cityArray objectAtIndex:row];
NSString *msg = [NSString stringWithFormat:@"province=%@,city=%@", seletedProvince,seletedCity];
NSLog(@"%@",msg);
}
}

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原文地址：http://www.cnblogs.com/anjiubo/p/5293378.html

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