8.3 UIPickerView 选择视图控制器

#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>

@interface ViewController ()<UIPickerViewDelegate,UIPickerViewDataSource>
{
    UIPickerView *_pickerView;
    
    // 数据源
    NSMutableArray *_arrayM;
    
    // 转动的声音
    SystemSoundID _rotationSound;
    
    // 赢得声音
    SystemSoundID _winSound;
    
    // 定时器
    NSTimer *_timer;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    _pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 60, 0, 0)];
    _pickerView.dataSource = self;
    _pickerView.delegate = self;
    [self.view addSubview:_pickerView];
    
    // 添加一个启动按钮
    UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(0, 400, self.view.frame.size.width, 50)];
    btn.backgroundColor = [UIColor lightGrayColor];
    [btn setTitle:@"启动" forState:UIControlStateNormal];
    btn.titleLabel.font = [UIFont systemFontOfSize:30];
    [btn addTarget:self action:@selector(clickButton) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn];
    
    // 注册声音
    NSString *winPath = [[NSBundle mainBundle] pathForResource:@"win" ofType:@"wav"];
    NSURL *url = [NSURL fileURLWithPath:winPath];
    AudioServicesCreateSystemSoundID((__bridge CFURLRef)(url), &_winSound);
    NSString *rotaionPath = [[NSBundle mainBundle] pathForResource:@"crunch" ofType:@"wav"];
    NSURL *rotaionUrl = [NSURL fileURLWithPath:rotaionPath];
    AudioServicesCreateSystemSoundID((__bridge CFURLRef)(rotaionUrl), &_rotationSound);
    
}

- (void)clickButton
{
    int count = 1;
    int oldRow = -1;
    
    for (int i = 0; i < 5; i ++) {
        int row = arc4random() % 6;
        [_pickerView selectRow:row inComponent:i animated:YES];
        // 播放开始的声音
        AudioServicesPlaySystemSound(_rotationSound);
        
        if (row == oldRow) {
            count ++;
        }else{
            count = 1;
        }
        oldRow = row;
        
        if (count == 3) {
            break;
        }
    }
    
    // 赢
    if (count == 3) {
        // 播放赢的声音
        AudioServicesPlaySystemSound(_winSound);
    }
}

#pragma mark -pickerView 数据源方法
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    return 6;
}

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 5;
}

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
    // 获取复用View
    UIImageView *imageView = (UIImageView *)view;
    if (!imageView) {
        imageView = [[UIImageView alloc] initWithFrame:CGRectMake(100,100, 60, 50)];
    }
    
    NSString *imageName = [NSString stringWithFormat:@"%ld.png",row + 1];
    imageView.image = [UIImage imageNamed:imageName];
    
    return imageView;
}

#pragma  mark - 设置picker每组的高度
- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component
{
    return 70;
}
#pragma  mark - 设置picker每组的宽度
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component
{
    return 60;
}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    NSLog(@"%ld--%ld",row, component);
}
@end

UIPickerView 选择视图控制器.png