利用UIScrollView实现几个页面的切换

#import "YCView.h"@interface ViewController ()<UIScrollViewDelegate>@PRoperty (nonatomic, strong)UIScrollView *scrollV;@property (weak, nonatomic) IBOutlet UIButton *usesbtn;@property (weak, nonatomic) IBOutlet UIButton *partBtn;@property (weak, nonatomic) IBOutlet UIButton *serverBtn;@end@implementation ViewController//懒加载- (UIScrollView *)scrollV{    if(!_scrollV)    {        _scrollV = [[UIScrollView alloc] init];        //设置scrollView的frame        CGFloat scrollX = 0;        CGFloat scrollY = 110;        CGFloat scrollW = CGRectGetWidth(self.view.bounds);        CGFloat scrollH = CGRectGetHeight(self.view.bounds);        _scrollV.frame = CGRectMake(scrollX, scrollY, scrollW, scrollH);        //设置代理        _scrollV.delegate = self;        //将scrollView添加到控制器的view上        [self.view addSubview:_scrollV];            }    return _scrollV;}- (void)viewDidLoad {    [super viewDidLoad];    //添加视图 view    [self addScrollView];    self.scrollV.contentOffset = CGPointMake(0, 0);}- (void)addScrollView{    //添加3个view    for(int i = 0; i < 3; i++)    {       CGFloat viewX = i * [UIScreen mainScreen].bounds.size.width;       CGFloat viewY = 0;       CGFloat viewW = [UIScreen mainScreen].bounds.size.width;       CGFloat viewH = [UIScreen mainScreen].bounds.size.height - 108;        YCView *v = [[YCView alloc] initWithFrame:CGRectMake(viewX, viewY, viewW, viewH)];        v.backgroundColor = [UIColor colorWithRed:arc4random_uniform(255)/ 255.0 green:arc4random_uniform(255)/ 255.0 blue:arc4random_uniform(255)/ 255.0 alpha:1.0];        [self.scrollV addSubview:v];    }    //设置frame，偏移量    //设置分页    self.scrollV.pagingEnabled = YES;    self.scrollV.backgroundColor = [UIColor orangeColor];    //设置滚动范围    self.scrollV.contentSize = CGSizeMake([UIScreen mainScreen].bounds.size.width * 3, [UIScreen mainScreen].bounds.size.height);    //设置偏移量    self.scrollV.contentOffset = CGPointMake([UIScreen mainScreen].bounds.size.width, 0);    //取消scrollView滚动到边缘的弹簧效果    self.scrollV.bounces = NO;    //隐藏水平滚动条    self.scrollV.showsHorizontalScrollIndicator = NO;}#pragma mark --UIScrollViewDelegate- (void)scrollViewDidScroll:(UIScrollView *)scrollView{    //设置按钮被选中状态下的颜色    scrollView.contentOffset.x == 0 ? [self.usesbtn setTitleColor:[UIColor orangeColor] forState:UIControlStateNormal] : [self.usesbtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];    scrollView.contentOffset.x == ([UIScreen mainScreen].bounds.size.width) ? [self.partBtn setTitleColor:[UIColor orangeColor] forState:UIControlStateNormal] : [self.partBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];    scrollView.contentOffset.x == ([UIScreen mainScreen].bounds.size.width) * 2 ? [self.serverBtn setTitleColor:[UIColor orangeColor] forState:UIControlStateNormal] : [self.serverBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];}#pragma mark --btnClick- (IBAction)usesBtnClick:(id)sender {    //跳转到第1个view  contentOffset.x = 屏幕的宽度 * 0    //重置scrollView的位置    [UIView animateWithDuration:0.5 animations:^{        self.scrollV.contentOffset = [self ScrollViewWithContentOffSetPage:0];    }];}- (IBAction)partBtnClick:(id)sender {    //跳转到第2个view  contentOffset.x = 屏幕的宽度 * 1    //重置scrollView的位置    [UIView animateWithDuration:0.5 animations:^{        self.scrollV.contentOffset = [self ScrollViewWithContentOffSetPage:1];    }];    }- (IBAction)serverBtnClick:(id)sender {    //跳转到第3个view  contentOffset.x = 屏幕的宽度 * 2    //重置scrollView的位置    [UIView animateWithDuration:0.5 animations:^{        self.scrollV.contentOffset = [self ScrollViewWithContentOffSetPage:2];    }];}//返回scrollView偏移量- (CGPoint)ScrollViewWithContentOffSetPage:(NSInteger)page{    return CGPointMake(([UIScreen mainScreen].bounds.size.width) * page, 0);}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end

#import "YCView.h"#import "YCCellView.h"static NSString *idenifer = @"YCCollectionViewCell";#define CellWeigth ([UIScreen mainScreen].bounds.size.width)/3.0#define CellHeigth 44@interface YCView ()<UITableViewDataSource, UITableViewDelegate>@property (strong, nonatomic)NSArray *parts;@property (strong, nonatomic)NSMutableArray *Views;@end@implementation YCView//懒加载- (NSMutableArray *)Views{    if(!_Views){        _Views = [NSMutableArray array];    }    return _Views;}//懒加载- (NSArray *)parts{    if(!_parts)    {        _parts = [NSArray array];        _parts = @[@"热门推荐", @"汽车外饰", @"香水/净化", @"功能用品", @"美容养护", @"安全/防护", @"影音导航"];    }    return _parts;}- (instancetype)init{    if(self = [super init])    {        [self addView];    }    return self;}- (instancetype)initWithFrame:(CGRect)frame{    if(self = [super initWithFrame:frame])    {         [self addView];    }    return self;}- (void)addView{    //添加tableView    UITableView *tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, -44, CellWeigth, [UIScreen mainScreen].bounds.size.height) style:UITableViewStyleGrouped];    tableView.backgroundColor = [UIColor redColor];    tableView.dataSource = self;    tableView.delegate = self;    [self addSubview:tableView];}#pragma mark --UITableViewDataSource- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{    return self.parts.count;}- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{    static NSString *ID = @"YCCell";    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];    if(cell == nil)    {        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:ID];    }    cell.textLabel.text = self.parts[indexPath.row];    return cell;}#pragma mark --UITableViewDelegate- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{    [self addBestView];}- (void)addBestView{    YCCellView *view = [[YCCellView alloc] initWithFrame:CGRectMake(CellWeigth, 0, ([UIScreen mainScreen].bounds.size.width)-CellWeigth, [UIScreen mainScreen].bounds.size.height)];    view.backgroundColor = [UIColor redColor];    [[self.Views lastObject] removeFromSuperview];    [self.Views addObject:view];    [self addSubview:view];}- (void)layoutSubviews{    [super layoutSubviews];}@end

#import "YCCellView.h"#define ViewMagin 10#define ViewHeight 90#define ViewWeight (([UIScreen mainScreen].bounds.size.width)-CellWeigth - 3*ViewMagin)/3.0#define CellWeigth ([UIScreen mainScreen].bounds.size.width)/3.0@interface YCCellView ()@end@implementation YCCellView- (instancetype)init{    if(self = [super init])    {        [self addCollectionView];    }    return self;}- (instancetype)initWithFrame:(CGRect)frame{    if(self = [super initWithFrame:frame])    {        [self addCollectionView];    }    return self;}- (void)addCollectionView{    for(int i = 0; i < 4; i++)    {        for(int j = 0; j < 3; j++)        {            UIView *v = [[UIView alloc] initWithFrame:CGRectMake(j * (ViewWeight + ViewMagin), i * (ViewHeight + ViewMagin), ViewWeight, ViewHeight)];            v.backgroundColor = [UIColor colorWithRed:arc4random_uniform(255)/ 255.0 green:arc4random_uniform(255)/ 255.0 blue:arc4random_uniform(255)/ 255.0 alpha:1.0];            [self addSubview:v];        }    }}@end