UIPickerView

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UIPickerView相关

- (void)viewDidLoad {    [super viewDidLoad];        //加载资源文件    [self loadResourceFile];        //创建视图    [self initSubViews];}

#pragma mark - 加载资源文件-(void)loadResourceFile{    NSBundle *bundle = [NSBundle mainBundle];    NSString *plistPath = [bundle pathForResource:@"provinces_cities"                                           ofType:@"plist"];    //获取属性列表文件中的全部数据    NSDictionary *dict = [[NSDictionary alloc] initWithContentsOfFile:plistPath];    self.pickerData = dict;        //省份名数据    self.pickerProvincesData =  [self.pickerData allKeys];        //默认取出第一个省的所有市的数据    NSString *seletedProvince = [self.pickerProvincesData objectAtIndex:0];    self.pickerCitiesData = [self.pickerData objectForKey:seletedProvince];}

#pragma mark - 创建视图-(void)initSubViews{        CGRect screen = [[UIScreen mainScreen] bounds];        /// 1.选择器    CGFloat pickerViewWidth = 320;    CGFloat pickerViewHeight = 162;    self.pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 0, pickerViewWidth, pickerViewHeight)];        //设置self为委托对象、self为数据源对象    self.pickerView.dataSource = self;    self.pickerView.delegate = self;        [self.view addSubview:self.pickerView];        /// 2.添加标签    CGFloat labelWidth = 200;    CGFloat labelHeight = 21;    CGFloat labelTopView = 273;    self.label = [[UILabel alloc] initWithFrame:CGRectMake((screen.size.width - labelWidth)/2 , labelTopView, labelWidth, labelHeight)];        self.label.text = @"Label";    //字体左右居中    self.label.textAlignment = NSTextAlignmentCenter;    [self.view addSubview:self.label];        /// 3.Button按钮    UIButton* button= [UIButton buttonWithType:UIButtonTypeSystem];    [button setTitle:@"Button" forState:UIControlStateNormal];        CGFloat buttonWidth = 46;    CGFloat buttonHeight = 30;    CGFloat buttonTopView = 374;        button.frame = CGRectMake((screen.size.width - buttonWidth)/2 , buttonTopView, buttonWidth, buttonHeight);    //指定事件处理方法    [button addTarget:self action:@selector(onclick:) forControlEvents: UIControlEventTouchUpInside];    [self.view addSubview:button];}

#pragma mark - 按钮的点击事件- (void)onclick:(id)sender {        NSInteger row1 = [self.pickerView selectedRowInComponent:0];    NSInteger row2 = [self.pickerView selectedRowInComponent:1];    NSString *selected1 = [self.pickerProvincesData objectAtIndex:row1];    NSString *selected2 = [self.pickerCitiesData objectAtIndex:row2];        NSString *title = [[NSString alloc] initWithFormat:@"%@，%@市", selected1,selected2];        self.label.text = title;    }

#pragma mark --实现协议UIPickerViewDataSource方法//轮播器个数- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {    return 2;}//每个轮播器的行数- (NSInteger)pickerView:(UIPickerView *)pickerViewnumberOfRowsInComponent:(NSInteger)component {    if (component == 0) {//省份个数        return [self.pickerProvincesData count];    } else {//市的个数        return [self.pickerCitiesData count];    }    }

#pragma mark --实现协议UIPickerViewDelegate方法//选择器组件的显示相关-(NSString *)pickerView:(UIPickerView *)pickerView            titleForRow:(NSInteger)row forComponent:(NSInteger)component {    if (component == 0) {//选择省份名        return [self.pickerProvincesData objectAtIndex:row];    } else {//选择市名        return [self.pickerCitiesData objectAtIndex:row];    }}//选择器组件的选择相关（显示发生变化就会调用此方法）- (void)pickerView:(UIPickerView *)pickerView      didSelectRow:(NSInteger)row inComponent:(NSInteger)component {    if (component == 0) {        NSString *seletedProvince = [self.pickerProvincesData objectAtIndex:row];        NSArray *array = [self.pickerData objectForKey:seletedProvince];        self.pickerCitiesData = array;        //刷新组件内容        [self.pickerView reloadComponent:1];    }}

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