使用UISegmentedControl和UIScrollVie

今天要写个聊天页面,需要用到可以滚动的显示方式,滑动页面切换控制器,点击UISegmentedControl同样切换界面.UISegmentedControl不常用,折腾一个小时,总算可以用了,

直接贴代码,挺简单的.

// 获取屏幕宽高#define SCREEN_WIDTH  [UIScreen mainScreen].bounds.size.width#define SCREEN_HEIGHT [UIScreen mainScreen].bounds.size.height@interface ViewController ()@property(nonatomic,strong)UIView * navBgView;

@property(nonatomic,strong)UIScrollView * scrollView;

@property(nonatomic,strong)UIPageControl * pageControl;

@property(nonatomic,strong)UISegmentedControl * segmentControl;

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

self.navigationController.navigationBarHidden = YES;

[self createNav];

[self createUI];

}

#pragma mark - 导航栏

-(void)createNav{

_navBgView = [[UIView alloc]initWithFrame:CGRectMake(0, 0,SCREEN_WIDTH, 64)];

[self.view addSubview:_navBgView];

_navBgView.backgroundColor = [UIColor orangeColor];

#pragma mark - 分页控制器

NSArray * items = @[@"消息",@"联系人",@"动态"];

_segmentControl = [[UISegmentedControl alloc]initWithItems:items];

[_navBgView addSubview:_segmentControl];

_segmentControl.frame = CGRectMake(SCREEN_WIDTH*0.5 - 75, 27, 150, 30);

_segmentControl.selectedSegmentIndex = 0;

_segmentControl.tintColor = [UIColor whiteColor];

[_segmentControl addTarget:self action:@selector(changeView:) forControlEvents:UIControlEventValueChanged];

}

#pragma mark - UI

-(void)createUI{

_scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 64, SCREEN_WIDTH, SCREEN_HEIGHT)];

[self.view addSubview:_scrollView];

_scrollView.contentSize = CGSizeMake(SCREEN_WIDTH*3, SCREEN_HEIGHT);

_scrollView.bounces = NO;

_scrollView.pagingEnabled = YES;

_scrollView.showsHorizontalScrollIndicator = NO;

_scrollView.delegate = self;

_scrollView.backgroundColor = [UIColor whiteColor];

NSArray * arr = @[@"AViewController",@"BViewController",@"CViewController"];

for (int i = 0; i< arr.count; i++) {

Class class = NSClassFromString(arr[i]);

UIViewController * viewCon = [[class alloc]init];

viewCon.view.frame = CGRectMake(SCREEN_WIDTH*i, 64, SCREEN_WIDTH, SCREEN_HEIGHT-64);

[_scrollView addSubview:viewCon.view];

}

//分页

_pageControl = [[UIPageControl alloc]initWithFrame:CGRectMake(SCREEN_WIDTH/3, 300, 0, 0)];

_pageControl.numberOfPages = 3;

_pageControl.pageIndicatorTintColor = [UIColor whiteColor];

_pageControl.currentPageIndicatorTintColor = [UIColor whiteColor];

[self.view addSubview:_pageControl];

}

#pragma mark - scrollView delegate

-(void)scrollViewDidScroll:(UIScrollView *)scrollView{

// 计算当前在第几页

_pageControl.currentPage = (NSInteger)(scrollView.contentOffset.x / [UIScreen mainScreen].bounds.size.width);

_segmentControl.selectedSegmentIndex = _pageControl.currentPage;

}

#pragma mark - 分页事件

-(void)changeView:(UISegmentedControl *)sgmentC{

NSInteger index = sgmentC.selectedSegmentIndex;

NSLog(@"%ld",index);

//改变当前的显示范围

[_scrollView setContentOffset:CGPointMake(index*SCREEN_WIDTH, 0)];

}

效果图