iOS-封装UIPickerView

创建类WJPickerView继承与UIView

ProvinceModel是省市的model,包含属性

@property (nonatomic, strong) NSString *provinceCode;

@property (nonatomic, strong) NSString *provinceName;

@property (nonatomic, strong) NSString *cityCode;

@property (nonatomic, strong) NSString *cityName;

WJPickerView.h

#import <UIKit/UIKit.h>
#import "ProvinceModel.h"
/**
 *  回调block
 *
 *  @param currentModel 选中当前省的model
 */
typedef void(^selectProvinceInfoBlock) (ProvinceModel * currentModel);
@interface WJPickerView : UIView
/**
 *  返回选择的数据
 *
 *  @param block 回调block
 */
-(void)setSelectProvinceInfoBlock:(selectProvinceInfoBlock)block;
/**
 *  显示PickerView
 */
-(void)showPickerView;
@end

WJPickerView.m

#import "WJPickerView.h"
#define PROVINCE_CITYS @"citys"
#define PROVINCE_AND_CITYS_NAME @"name"
#define PROVINCE_AND_CITYS_CODE @"code"
#define PICKER_VIEW_ROW_HEIGHT 30.0f
#define PICKER_VIEW_COMPONENT_COUNT 2

@interface WJPickerView ()<UIPickerViewDelegate,UIPickerViewDataSource>
/**用来触发pickerView的textField*/
@property(nonatomic,strong)UITextField *inputTextField;
/**pickerView*/
@property(nonatomic,strong)UIPickerView * provincePickerView;
/**存储省市信息*/
@property(nonatomic,strong)NSMutableArray * provinceArray;
/**当前选中第一列的行数*/
@property(nonatomic,assign)NSInteger currentFirstRow;
/**当前选中第二列行数*/
@property(nonatomic,assign)NSInteger currentSecondRow;

@property(nonatomic,strong)selectProvinceInfoBlock  block;

@end
@implementation WJPickerView

-(UITextField *)inputTextField{
    if (!_inputTextField) {
        _inputTextField = [[UITextField alloc] init];
    }
    return _inputTextField;
}

-(UIPickerView *)provincePickerView{
    if (!_provincePickerView) {
        _provincePickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(, , , )];
        _provincePickerView.showsSelectionIndicator = YES;
        _provincePickerView.dataSource = self;
        _provincePickerView.delegate = self;
    }
    return _provincePickerView;
}

-(instancetype)init{
    self = [super init];
    if (self) {
        /**从plist读取省市信息*/
        [self loadAllProvinceData];
        /**实例化PickerView并添加到inputView上*/
        [self addPickerViewToCurrentView];
    }
    return self;
}

#pragma mark - 从plist读取省市信息
-(void)loadAllProvinceData{
    NSString * filePath = [[NSBundle mainBundle] pathForResource:@"province" ofType:@"plist"];
    _provinceArray = [[NSMutableArray alloc] initWithContentsOfFile:filePath];
}

#pragma mark - 实例化PickerView并添加到inputView上
-(void)addPickerViewToCurrentView{
    [self addSubview:self.inputTextField];
    self.inputTextField.inputView = self.provincePickerView;
    self.inputTextField.inputView.backgroundColor = [UIColor whiteColor];
    /**往inputAccessoryView上添加ToolBar*/
    [self addToolBarItem];
}

#pragma mark - 往inputAccessoryView上添加ToolBar
-(void)addToolBarItem{
    /**textView键盘定制回收按钮*/
    UIToolbar * toolBar = [[UIToolbar alloc] initWithFrame:CGRectMake(, , , )];

    UIBarButtonItem * item0 = [[UIBarButtonItem alloc] initWithTitle:@"取消" style:UIBarButtonItemStyleDone target:self action:@selector(hiddenPickerView)];

    UIBarButtonItem * item1 = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];

    UIBarButtonItem * item2 = [[UIBarButtonItem alloc] initWithTitle:@"完成" style:UIBarButtonItemStyleDone target:self action:@selector(tapSelectOkButton)];

    toolBar.items = @[item0,item1,item2];
    self.inputTextField.inputAccessoryView = toolBar;

}

#pragma mark - 数据回调
-(void)setSelectProvinceInfoBlock:(selectProvinceInfoBlock)block{
    if (self.block == nil) {
        if (block != nil) {
            self.block = block;
        }
    }
}

#pragma mark - 显示pickerView
-(void)showPickerView{
    [self.inputTextField becomeFirstResponder];
    [self.provincePickerView selectRow:_currentFirstRow inComponent: animated:NO];
    [self.provincePickerView selectRow:_currentSecondRow inComponent: animated:NO];
}

#pragma mark - 隐藏PickerView
-(void)hiddenPickerView{
    [self.superview endEditing:YES];
}

#pragma mark - 点击完成
-(void)tapSelectOkButton{

    [self hiddenPickerView];
    ProvinceModel * provinceModel = [[ProvinceModel alloc] init];
    if (_currentFirstRow < _provinceArray.count) {
        provinceModel.provinceName = [NSString stringWithFormat:@"%@", _provinceArray[_currentFirstRow][PROVINCE_AND_CITYS_NAME]];
        provinceModel.provinceCode = [NSString stringWithFormat:@"%@", _provinceArray[_currentFirstRow][PROVINCE_AND_CITYS_CODE]];
        NSArray * citys = _provinceArray[_currentFirstRow][PROVINCE_CITYS];
        if (_currentSecondRow < citys.count) {
            provinceModel.cityName = [NSString stringWithFormat:@"%@", citys[_currentSecondRow][PROVINCE_AND_CITYS_NAME]];
            provinceModel.cityCode = [NSString stringWithFormat:@"%@", citys[_currentSecondRow][PROVINCE_AND_CITYS_CODE]];

            if (self.block) {
                self.block(provinceModel);
            }
        }
    }
}

#pragma mark - UIPickerViewDataSource
/**列数*/
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
    return PICKER_VIEW_COMPONENT_COUNT;
}

/**行数*/
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
    if (component ==  && _provinceArray != nil) {
        return _provinceArray.count;
    }

    if (component ==  && _provinceArray != nil) {
        NSArray * citys = _provinceArray[_currentFirstRow][PROVINCE_CITYS];
        return citys.count;
    }
    return ;
}

#pragma mark - UIPickerViewDelegate
/**行高*/
-(CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component{

    return PICKER_VIEW_ROW_HEIGHT;

}

/**自定义PickerView显示的View*/
-(UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view{

    UILabel *pickerLabel = [[UILabel alloc] initWithFrame:view.frame];
    pickerLabel.minimumScaleFactor = ;
    pickerLabel.adjustsFontSizeToFitWidth = YES;
    pickerLabel.textAlignment = NSTextAlignmentCenter;
    pickerLabel.font = [UIFont boldSystemFontOfSize:15.0f];
    pickerLabel.text = [self pickerView:pickerView titleForRow:row forComponent:component];

    return pickerLabel;

}

/**每行每列设置title*/
-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{

    if (component ==  && row < _provinceArray.count) {
        return _provinceArray[row][PROVINCE_AND_CITYS_NAME];
    }
    if (component == ) {
        NSArray *citys = _provinceArray[_currentFirstRow][PROVINCE_CITYS];
        if (row < citys.count) {
            return citys[row][PROVINCE_AND_CITYS_NAME];
        }

    }
    return @"";
}

/**选中后的回调*/
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{

    if (component == ) {
        _currentFirstRow = row;
    }
    if (component == ) {
        _currentSecondRow = row;
    }

    [self.provincePickerView reloadAllComponents];
}
@end