省市便利 UIPicherView

@property (strong,nonatomic) UIPickerView *pickerV;

@property (strong,nonatomic) NSArray *arr;

@property (strong,nonatomic) NSMutableArray *arrCity;

@property (strong,nonatomic) NSMutableArray *arrPro;

@property (assign,nonatomic) int index;

@property (strong,nonatomic) NSString *provice;

@property (strong,nonatomic) NSString *city;

@property (strong,nonatomic) UIButton *btn;

 

 

self.pickerV = [[UIPickerView alloc] initWithFrame:CGRectMake(40, 100, 300, 200)];

self.pickerV.backgroundColor = [UIColor grayColor];

self.pickerV.delegate = self;

self.pickerV.dataSource = self;

[self.view addSubview:self.pickerV];

NSString *path = [[NSBundle mainBundle] pathForResource:@"city" ofType:@".plist"];

self.arr = [NSArray array];

self.arr = [NSArray arrayWithContentsOfFile:path];

self.arrCity = [NSMutableArray array];

self.arrPro = [NSMutableArray array];

for (NSDictionary *dic in self.arr)

{

[self.arrPro addObject:dic[@"State"]];

}

self.index = (int)[self.pickerV selectedRowInComponent:0];

NSDictionary *dic1 = [self.arr objectAtIndex:self.index];

[self.arrCity addObjectsFromArray:dic1[@"Cities"]];

self.btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];

self.btn.backgroundColor = [UIColor blueColor];

-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView

{

return 2;

}

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

{

if (component == 0)

{

return self.arrPro.count;

}

else

{

return self.arrCity.count;

}

}

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

{

if (component == 0)

{

return self.arrPro[row];

}

else

{

return self.arrCity[row][@"city"];

}

}

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

{

if (component == 0)

{

[self.arrCity removeAllObjects];

NSString *provice = [self.arrPro objectAtIndex:row];

[self.arrCity addObjectsFromArray:self.arr[row][@"Cities"]];

[self.pickerV reloadComponent:1];

NSInteger cityIndex = [self.pickerV selectedRowInComponent:1];

NSString *city = [self.arrCity objectAtIndex:cityIndex];

NSString *msg = [NSString stringWithFormat:@"%@,%@",provice,city];

NSLog(@"%@",msg);

}

else

{

NSInteger proviceIndex = [self.pickerV selectedRowInComponent:0];

NSString *provice = [self.arrPro objectAtIndex:proviceIndex];

NSString *city = [self.arrCity objectAtIndex:row];

NSString *msg = [NSString stringWithFormat:@"%@,%@",provice,city];

NSLog(@"%@",msg);

}

}