iOS PickerView选择视图

原文demo：

@interface ViewController ()<UIPickerViewDelegate,UIPickerViewDataSource>
{

    UIPickerView * pickerView;

    NSMutableArray * listPicker;
    NSMutableArray * listPicker2;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    [self CreatUI];

    UIButton *back = [UIButton buttonWithType:UIButtonTypeRoundedRect];

    back.frame = CGRectMake(, , , );
    back.backgroundColor = [UIColor greenColor];
    [back addTarget:self action:@selector(backk) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:back];

}
-(void)backk{

    [self presentViewController:[[RootViewController alloc]init] animated:YES completion:nil];

}

-(void)CreatUI{

    pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(, , , )];

    //显示选中框
    pickerView.showsSelectionIndicator = YES;
    pickerView.delegate =self;
    pickerView.dataSource  = self;

    [self.view addSubview:pickerView];

    listPicker = [NSMutableArray array];
    listPicker2 = [NSMutableArray array];

    //dataSoure
    for (int i =; i<; i++) {

        [listPicker addObject:[NSString stringWithFormat:@"%d",i]];
        [listPicker2 addObject:[NSString stringWithFormat:@"%02d",i]];

    }

}

/////相关代理
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{

    return ;//列数
}
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{

    return listPicker.count;//每列的row个数

}

//列宽
-(CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component{

    if (component==) {
        return ;
    }else{
        return ;
    }

}
//高
-(CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component{

    if (component==) {
        return    ;
    }else{

        return ;
    }

}
//选中行
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{

}

//返回当前行的内容 此处将是数组中数值添加到滚动的那个显示兰 批量操作显示的内容
-(NSString*)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
    if (component ==) {
        return [NSString stringWithFormat:@"%@ 列",[listPicker objectAtIndex:row]];
    }else{

        return [NSString stringWithFormat:@"%@ 个",[listPicker objectAtIndex:row]];
    }

}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

一、两列 独立旋转

@interface LinkageViewController ()<UIPickerViewDelegate,UIPickerViewDataSource>

{

    UIPickerView * pickerViewv;

    NSArray * listPicker;//sheng
    NSArray * listPicker2;//shi

}
@property(nonatomic,strong) UILabel * label;

@end

@implementation LinkageViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self CreatUI];

    UIButton *back = [UIButton buttonWithType:UIButtonTypeRoundedRect];

    back.frame = CGRectMake(, , , );
    back.backgroundColor = [UIColor greenColor];
    [back addTarget:self action:@selector(backk) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:back];

}
-(void)backk{

    [self presentViewController:[[RootViewController alloc]init] animated:YES completion:nil];

}

-(void)CreatUI{

    pickerViewv = [[UIPickerView alloc] initWithFrame:CGRectMake(, , self.view.frame.size.width, )];

    //显示选中框
    pickerViewv.showsSelectionIndicator = YES;
    pickerViewv.delegate =self;
    pickerViewv.dataSource  = self;

    [self.view addSubview:pickerViewv];

    listPicker = [NSMutableArray array];
    listPicker2 = [NSMutableArray array];

    //读取数据
    NSString * path = [[NSBundle mainBundle]pathForResource:@"area" ofType:@"plist"];
    listPicker = [NSArray arrayWithContentsOfFile:path];
    listPicker2 = [NSArray arrayWithArray:listPicker[][@"Cities"]];

    //Label
    //label的布局约束
    self.label = [[UILabel alloc]initWithFrame:CGRectZero];
    self.label.translatesAutoresizingMaskIntoConstraints = NO;
    self.label.backgroundColor = [UIColor groupTableViewBackgroundColor];
    self.label.textColor = [UIColor greenColor];
    self.label.font = [UIFont systemFontOfSize:];
    [self.label setTextAlignment:NSTextAlignmentCenter];
    [self.view addSubview:self.label];
    NSArray * labelTop = [NSLayoutConstraint constraintsWithVisualFormat:@"V:[pickerViewv]-30-[_label(50)]" options: metrics:nil views:NSDictionaryOfVariableBindings(pickerViewv,_label)];
    NSArray * labelH = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-20-[_label]-20-|" options: metrics:nil views:NSDictionaryOfVariableBindings(_label)];
    [self.view addConstraints:labelTop];
    [self.view addConstraints:labelH];
}

/////相关代理
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{

    return ;//列数
}
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{

    NSInteger rows =;

    switch (component) {
        case :
            rows = listPicker.count;
            break;
        case :
            rows = listPicker2.count;

        default:
            break;
    }

    return rows;
}

//列宽
-(CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component{

    if (component==) {
        return ;
    }else{
        return ;
    }

}
//高
-(CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component{

    if (component==) {
        return    ;
    }else{

        return ;
    }

}

//选中行
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{

    if (component==) {

        listPicker2 = listPicker[row][@"Cities"];
        [pickerViewv reloadComponent:];//刷新第几个
    }else{

        self.label.text = [NSString stringWithFormat:@"%@%@",listPicker[[pickerViewv selectedRowInComponent: ]][@"State"],listPicker2[[pickerViewv selectedRowInComponent:]][@"city"]];

    }

}

//返回当前行的内容 此处将是数组中数值添加到滚动的那个显示兰 批量操作显示的内容
-(NSString*)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
    if (component ==) {
        return listPicker[row][@"State"];
    }else{

        return listPicker2[row][@"city"];
    }

}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

二、第二列随着第一列刷新

@interface CustomViewController ()<UIPickerViewDelegate,UIPickerViewDataSource>
{

    UIPickerView * pickerView;

    NSMutableArray * listPicker;
    NSMutableArray * listPicker2;
}

@end

@implementation CustomViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    [self CreatUI];
    UIButton *back = [UIButton buttonWithType:UIButtonTypeRoundedRect];

    back.frame = CGRectMake(, , , );
    back.backgroundColor = [UIColor greenColor];
    [back addTarget:self action:@selector(backk) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:back];

}
-(void)backk{

    [self presentViewController:[[RootViewController alloc]init] animated:YES completion:nil];

}

-(void)CreatUI{

    pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(, , self.view.frame.size.width, self.view.frame.size.height-)];

    //显示选中框
    pickerView.showsSelectionIndicator = YES;
    pickerView.delegate =self;
    pickerView.dataSource  = self;

    [self.view addSubview:pickerView];

    listPicker = [NSMutableArray array];
    listPicker2 = [NSMutableArray array];

    //dataSoure
    for (int i =; i<; i++) {

        [listPicker addObject:[NSString stringWithFormat:@"%d",i]];
        [listPicker2 addObject:[NSString stringWithFormat:@"%02d",i]];

    }

}

/////相关代理
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{

    return ;//列数
}
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{

    return listPicker.count;//每列的row个数

}

//列宽
-(CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component{

    if (component==) {
        return ;
    }else{
        return ;
    }

}
//高
-(CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component{

    if (component==) {
        return    ;
    }else{

        return ;
    }

}
//选中行
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{

    if (component==) {
        //选中第一列。一般刷新第二列

        // [pickerViewv reloadComponent:1];//刷新第几个

    }else{
        //选中第二列。一般输出

           }

}
#pragma mark 给pickerview设置字体大小和颜色等
-(UIView*)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view{

    //可以自定义label
    UILabel * pickerlabel = (UILabel*)view;
    if (!pickerlabel) {

        pickerlabel = [[UILabel alloc] init];
        pickerlabel.adjustsFontSizeToFitWidth = YES;
        pickerlabel.textAlignment = NSTextAlignmentCenter;
        [pickerlabel setBackgroundColor:[UIColor lightGrayColor]];
        [pickerlabel setFont:[UIFont systemFontOfSize:]];

    }

    pickerlabel.text = [self pickerView:pickerView titleForRow:row forComponent:component];

    return pickerlabel;

}

//返回当前行的内容 此处将是数组中数值添加到滚动的那个显示兰 批量操作显示的内容
-(NSString*)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
    if (component ==) {
        return [NSString stringWithFormat:@"%@ 列",[listPicker objectAtIndex:row]];
    }else{

        return [NSString stringWithFormat:@"%@ 个",[listPicker objectAtIndex:row]];
    }

}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

三、自定义显示View