第一步初始化 UIPickerView *pickerview; //城市滚动表
NSDictionary *dict; //用于存储省份-城市的数据
NSArray *provinceArray; //省份的数组
NSArray *cityArray; //城市的数组
第二步需要引入代理 UIPickerViewDataSource,UIPickerViewDelegate,
第三步把拥有的地区从文件取出来 要文件留言NSBundle *bundle = [NSBundle mainBundle];
NSString *plistPath = [bundle pathForResource:@"city" ofType:@"plist"];
provinceArray=[NSArray arrayWithContentsOfFile:plistPath];
NSLog(@"-----------%@",provinceArray);
cityArray = [[provinceArray objectAtIndex:0] objectForKey:@"cities"];
NSLog(@"+ + + + + %@",cityArray);
pickerview = [[UIPickerView alloc]initWithFrame:CGRectMake(50, 200, 250, 100)];
pickerview.delegate =self;
pickerview.dataSource =self;
[self.View addSubview:pickerview];
／／用来显示取出的地区名字
placelabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 55, Kwidth, 25)];
placelabel.backgroundColor = [UIColor redColor];
placelabel.textAlignment = NSTextAlignmentLeft;
[self.View addSubview:placelabel];
下面的为代理方法
//轮子个数
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
return 2;
}
//确定picker的每个轮子的item数
- (NSInteger)pickerView:(UIPickerView *)pickerView
numberOfRowsInComponent:(NSInteger)component {
if (component == 0) {//省份个数
return [provinceArray count];
} else {//市的个数
return [cityArray count];
}
}
//确定每个轮子的每一项显示什么内容
#pragma mark 实现协议UIPickerViewDelegate方法
-(NSString *)pickerView:(UIPickerView *)pickerView
titleForRow:(NSInteger)row forComponent:(NSInteger)component {
switch (component) {
case 0:
return [[provinceArray objectAtIndex:row] objectForKey:@"state"];
break;
case 1:
return [cityArray objectAtIndex:row];
break;
default:
return @"";
break;
}
}
//监听轮子的移动
- (void)pickerView:(UIPickerView *)pickerView
didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
// NSLog(@"1111111111111 %d",cityArray.count);
// NSLog(@"1111111111111 %d",provinceArray.count);
//
switch (component) {
case 0:
cityArray = [[provinceArray objectAtIndex:row] objectForKey:@"cities"];
[pickerView selectRow:0 inComponent:1 animated:YES];
[pickerView reloadComponent:1];
NSLog(@"%@",[[provinceArray objectAtIndex:row] objectForKey:@"state"]);
NSLog(@"%@",[cityArray objectAtIndex:0]);
pla = [[NSString alloc]initWithFormat:@"%@",[[provinceArray objectAtIndex:row] objectForKey:@"state"]];
placelabel.text = [NSString stringWithFormat:@"%@-%@",[[provinceArray objectAtIndex:row] objectForKey:@"state"],[cityArray objectAtIndex:0]];
break;
case 1:
NSLog(@"%@",[cityArray objectAtIndex:row]);
placelabel.text = [NSString stringWithFormat:@"%@-%@",pla,[cityArray objectAtIndex:row]];
break;
default:
break;
}
}