UIScroll和UIPickView

• .h

#import <UIKit/UIKit.h>

#define WIDTH self.view.frame.size.width

#define HEIGHT self.view.frame.size.height

@interface ViewController : UIViewController<UIScrollViewDelegate, UIPickerViewDelegate, UIPickerViewDataSource>

/**

*  滚动视图

*/

@property (nonatomic, strong)UIScrollView *scroll;

/**

*  分页控件

*/

@property (nonatomic, strong)UIPageControl *page;

/**

*  滚动条

*/

@property (nonatomic, strong)UIPickerView *pick;

// 数据源

@property (nonatomic, strong)NSArray *arr_data;

@end

---

• .m

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad

{

[super viewDidLoad];

self.scroll = [[UIScrollView alloc] initWithFrame:self.view.frame];

self.scroll.backgroundColor = [UIColor grayColor];

self.scroll.contentSize = CGSizeMake(WIDTH*3, HEIGHT);

// 分页

self.scroll.pagingEnabled = YES;

// 隐藏滚动条

self.scroll.showsHorizontalScrollIndicator = NO;

UIImageView *imv1 = [[UIImageView alloc] initWithFrame:self.view.frame];

imv1.backgroundColor = [UIColor purpleColor];

UIImageView *imv2 = [[UIImageView alloc] initWithFrame:CGRectMake(WIDTH, 0, WIDTH, HEIGHT)];

imv2.backgroundColor = [UIColor blueColor];

UIImageView *imv3 = [[UIImageView alloc] initWithFrame:CGRectMake(WIDTH*2, 0, WIDTH, HEIGHT)];

imv3.backgroundColor = [UIColor redColor];

[self.scroll addSubview:imv1];

[self.scroll addSubview:imv2];

[self.scroll addSubview:imv3];

[self.view addSubview:self.scroll];

// 分页标识

self.page = [[UIPageControl alloc] initWithFrame:CGRectMake((WIDTH-120)/2, HEIGHT-100, 120, 30)];

self.page.numberOfPages = 3;

self.page.backgroundColor = [UIColor clearColor];

[self.view addSubview:self.page];

// 代理

self.scroll.delegate = self;

// 滚动条

self.arr_data = @[@"年", @"月", @"日", @"时", @"分", @"秒"];

self.pick = [[UIPickerView alloc] initWithFrame:CGRectMake((WIDTH-200)/2, HEIGHT-300, 200, 100)];

// 两个代理（代理和数据源）

self.pick.delegate = self;

self.pick.dataSource = self;

[self.view addSubview:self.pick];

}

// 分页

- (void)scrollViewDidScroll:(UIScrollView *)scrollView

{

self.page.currentPage = (int)scrollView.contentOffset.x/WIDTH;

}

// 代理

#pragma mark - delegate

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView

{

return 1;

}

#pragma mark - sourcedata

// 数据源

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component

{

return self.arr_data.count;

}

#pragma mark - title

- (nullable NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component

{

return self.arr_data[row];

}

#pragma mark - selecter

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component

{

// row：下标

NSLog(@"%@", self.arr_data[row]);

}

#pragma mark - rowheight

- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component

{

return 50;

}