UIPickerView省份城市

以下为相关代码，仅供参考：

#import <UIKit/UIKit.h>
typedef void (^ReturnCityBlock)(NSString *string,int provinceIndex,int cityIndex);
@interface PickerBgView : UIView<UIPickerViewDelegate, UIPickerViewDataSource>
@property (weak, nonatomic) IBOutlet UIButton *doneBtn;
@property (weak, nonatomic) IBOutlet UIButton *closeBtn;
@property (weak, nonatomic) IBOutlet UIPickerView *pickerView;
@property (weak, nonatomic) IBOutlet UIView *clearView;
@property (nonatomic, copy)ReturnCityBlock returnBlock;

@property (nonatomic, assign)int cityIndex;//城市
@property (nonatomic, assign)int provinceIndex;//省份

- (id)initWithReturnBlock:(ReturnCityBlock)block;
- (void)showInView:(UIView *)view;
- (void)cancelPicker;
@end

#import "PickerBgView.h"

@implementation PickerBgView{
    NSArray *provinces, *cities;
    NSString *_state;
    NSString *_city;
    
}

- (id)initWithReturnBlock:(ReturnCityBlock)block{
    self = [[[NSBundle mainBundle] loadNibNamed:@"PickerBgView" owner:self options:nil] objectAtIndex:0];
    if (self) {
        self.pickerView.delegate = self;
        self.pickerView.dataSource = self;
        provinces = [[NSArray alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"city.plist" ofType:nil]];
        [self.closeBtn addTarget:self action:@selector(cancelPickerViewAction:) forControlEvents:UIControlEventTouchUpInside];
        self.returnBlock = block;
        UITapGestureRecognizer *closeTap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(cancelGestureAction)];
        [self.clearView addGestureRecognizer:closeTap];
        [self.doneBtn addTarget:self action:@selector(doneBtnAction) forControlEvents:UIControlEventTouchUpInside];
    }
    return self;
}
#pragma mark - PickerView lifecycle

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 2;
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    switch (component) {
        case 0:
            return [provinces count];
            break;
        case 1:
            return [cities count];
            break;
        default:
            return 0;
            break;
    }
}

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    if (component == 0) {
        return [[provinces objectAtIndex:row] objectForKey:@"state"];
    }else{
        return [cities objectAtIndex:row];
    }
}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    switch (component) {
        case 0:
            _cityIndex = 0;
            cities = [[provinces objectAtIndex:row] objectForKey:@"cities"];
            [self.pickerView selectRow:_cityIndex inComponent:1 animated:YES];
            [self.pickerView reloadComponent:1];
            _state = [[provinces objectAtIndex:row] objectForKey:@"state"];
            _city = [cities objectAtIndex:_cityIndex];
            _provinceIndex = (int)row;
            break;
        case 1:
            _city = [cities objectAtIndex:row];
            _cityIndex = (int)row;
            break;
        default:
            break;
    }
   }
- (void)doneBtnAction{
    self.returnBlock([NSString stringWithFormat:@"%@%@",_state,_city],_provinceIndex,_cityIndex);
    [self cancelPicker];
}

#pragma mark - animation

- (void)showInView:(UIView *) view
{
    self.frame = CGRectMake(0, ScreenHeight, ScreenWidth, ScreenHeight);
    //默认已选中省份城市
    cities = [[provinces objectAtIndex:_provinceIndex] objectForKey:@"cities"];
    _state = [[provinces objectAtIndex:_provinceIndex] objectForKey:@"state"];
    _city = [cities objectAtIndex:_cityIndex];
    [self.pickerView selectRow:_provinceIndex inComponent:0 animated:YES];
    [self.pickerView selectRow:_cityIndex inComponent:1 animated:YES];
    [self.pickerView reloadAllComponents];
    
    [view addSubview:self];
    
    [UIView animateWithDuration:0.3 animations:^{
        self.frame = CGRectMake(0, 0, ScreenWidth, ScreenHeight);
    }];
}

- (void)cancelPicker
{
    [UIView animateWithDuration:0.3
                     animations:^{
                         self.frame = CGRectMake(0, self.frame.origin.y+self.frame.size.height, self.frame.size.width, self.frame.size.height);
                     }
                     completion:^(BOOL finished){
                         [self removeFromSuperview];
                         
                     }];
}

- (void)cancelGestureAction
{
    [self cancelPicker];
}
#pragma mark - cancel和ok
-(void)cancelPickerViewAction:(UIButton *)sender
{
    [self cancelPicker];
    
}
@end