UIPickerView的快速使用

#import "ViewController.h"

@interface ViewController ()<UIPickerViewDataSource,UIPickerViewDelegate>

@property (nonatomic,strong) UIPickerView *pickerView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [self.view addSubview:self.pickerView];
    self.pickerView.backgroundColor = [[UIColor orangeColor] colorWithAlphaComponent:0.1];
    self.navigationController.navigationBarHidden = YES;
}

//共有多少列
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
    return 2;
}

//每一列有多少行
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
    return 10;
}

//每一列的每一行展示什么标题
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
    return @"silence";
}

//返回第一列的宽度
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component {
    return 150;
}

//返回每一列第一行的高度
- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component {
    return 150;
}

//当选中第几列的第几行时调用
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
    NSLog(@"component = %ld-----row = %ld",component,row);
}

- (UIPickerView *)pickerView {
    if (!_pickerView) {
        _pickerView = [[UIPickerView alloc] init];
        _pickerView.frame = self.view.bounds;
        _pickerView.delegate = self;
        _pickerView.dataSource = self;
    }
    return _pickerView;
}

@end