iOS 新特性引导页

#import "NewFeatureController.h"
#import "NewFeatureCell.h"

@interface NewFeatureController ()

@property (nonatomic, weak) UIPageControl *control;

@end

@implementation NewFeatureController
static NSString *ID = @"cell";
- (instancetype)init
{

    UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
    
    // 设置cell的尺寸
    layout.itemSize = [UIScreen mainScreen].bounds.size;
    
    // 清空行距
    layout.minimumLineSpacing = 0;
    
    // 设置滚动的方向
    layout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
    
    return [super initWithCollectionViewLayout:layout];
}
// self.collectionView != self.view
// 注意： self.collectionView 是 self.view的子控件

// 使用UICollectionViewController
// 1.初始化的时候设置布局参数
// 2.必须collectionView要注册cell
// 3.自定义cell
- (void)viewDidLoad {
    [super viewDidLoad];
    
    
    // 注册cell,默认就会创建这个类型的cell
    [self.collectionView registerClass:[NewFeatureCell class] forCellWithReuseIdentifier:ID];

    // 分页
    self.collectionView.pagingEnabled = YES;
    self.collectionView.bounces = NO;
    self.collectionView.showsHorizontalScrollIndicator = NO;
    

    // 添加pageController
    [self setUpPageControl];
}
// 添加pageController
- (void)setUpPageControl
{
    // 添加pageController,只需要设置位置，不需要管理尺寸
    UIPageControl *control = [[UIPageControl alloc] init];
    
    control.numberOfPages = 4;
    control.pageIndicatorTintColor = [UIColor blackColor];
    control.currentPageIndicatorTintColor = [UIColor redColor];
    
    // 设置center
    control.center = CGPointMake(self.view.width * 0.5, self.view.height);
    _control = control;
    [self.view addSubview:control];
}

#pragma mark - UIScrollView代理
// 只要一滚动就会调用
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    // 获取当前的偏移量，计算当前第几页
    int page = scrollView.contentOffset.x / scrollView.bounds.size.width + 0.5;
    
    // 设置页数
    _control.currentPage = page;
}
#pragma mark - UICollectionView代理和数据源
// 返回有多少组
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
    return 1;
}
// 返回第section组有多少个cell
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    return 4;
}



// 返回cell长什么样子
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    // dequeueReusableCellWithReuseIdentifier
    // 1.首先从缓存池里取cell
    // 2.看下当前是否有注册Cell,如果注册了cell，就会帮你创建cell
    // 3.没有注册，报错
    NewFeatureCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:ID forIndexPath:indexPath];

    
    // 拼接图片名称 3.5 320 480
    CGFloat screenH = [UIScreen mainScreen].bounds.size.height;
    NSString *imageName = [NSString stringWithFormat:@"new_feature_%ld",indexPath.row + 1];
    if (screenH > 480) { // 5 , 6 , 6 plus
        imageName = [NSString stringWithFormat:@"new_feature_%ld-568h",indexPath.row + 1];
    }
    cell.image = [UIImage imageNamed:imageName];
    
    
    [cell setIndexPath:indexPath count:4];

    
    return cell;
    
}

//
//  NewFeatureCell.h
//  
//
//  Created by apple on 15-3-7.
//  Copyright (c) 2015年 apple. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface NewFeatureCell : UICollectionViewCell

@property (nonatomic, strong) UIImage *image;


// 判断是否是最后一页
- (void)setIndexPath:(NSIndexPath *)indexPath count:(int)count;
@end

//  NewFeatureCell.m
//  
//
//  Created by apple on 15-3-7.
//  Copyright (c) 2015年 apple. All rights reserved.
//

#import "NewFeatureCell.h"
#import "TabBarController.h"

@interface NewFeatureCell ()

@property (nonatomic, weak) UIImageView *imageView;

@property (nonatomic, weak) UIButton *shareButton;

@property (nonatomic, weak) UIButton *startButton;

@end

@implementation NewFeatureCell

- (UIButton *)shareButton
{
    if (_shareButton == nil) {
        
        UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
        [btn setTitle:@"分享给大家" forState:UIControlStateNormal];
        [btn setImage:[UIImage imageNamed:@"new_feature_share_false"] forState:UIControlStateNormal];
        [btn setImage:[UIImage imageNamed:@"new_feature_share_true"] forState:UIControlStateSelected];
        [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
        [btn sizeToFit];
        
        [self.contentView addSubview:btn];
        
        _shareButton = btn;
        
    }
    return _shareButton;
}

- (UIButton *)startButton
{
    if (_startButton == nil) {
        UIButton *startBtn = [UIButton buttonWithType:UIButtonTypeCustom];
        [startBtn setTitle:@"开始微博" forState:UIControlStateNormal];
        [startBtn setBackgroundImage:[UIImage imageNamed:@"new_feature_finish_button"] forState:UIControlStateNormal];
        [startBtn setBackgroundImage:[UIImage imageNamed:@"new_feature_finish_button_highlighted"] forState:UIControlStateHighlighted];
        [startBtn sizeToFit];
        [startBtn addTarget:self action:@selector(start) forControlEvents:UIControlEventTouchUpInside];
        [self addSubview:startBtn];
        _startButton = startBtn;

    }
    return _startButton;
}

- (UIImageView *)imageView
{
    if (_imageView == nil) {
        
        UIImageView *imageV = [[UIImageView alloc] init];
        
        _imageView = imageV;
        
        // 注意:一定要加载contentView
        [self.contentView addSubview:imageV];
        
    }
    return _imageView;
}

// 布局子控件的frame
- (void)layoutSubviews
{
    [super layoutSubviews];
    
    self.imageView.frame = self.bounds;
    
    // 分享按钮
    self.shareButton.center = CGPointMake(self.width * 0.5, self.height * 0.8);
    
    
    // 开始按钮
     self.startButton.center = CGPointMake(self.width * 0.5, self.height * 0.9);
}

- (void)setImage:(UIImage *)image
{
    _image = image;
    
    self.imageView.image = image;
}

// 判断当前cell是否是最后一页
- (void)setIndexPath:(NSIndexPath *)indexPath count:(int)count
{
    if (indexPath.row == count - 1) { // 最后一页,显示分享和开始按钮
        self.shareButton.hidden = NO;
        self.startButton.hidden = NO;
        
        
    }else{ // 非最后一页，隐藏分享和开始按钮
        self.shareButton.hidden = YES;
        self.startButton.hidden = YES;
    }
}

// 点击开始微博的时候调用
- (void)start
{
    // 进入tabBarVc
    TabBarController *tabBarVc = [[TabBarController alloc] init];
   
    // 切换根控制器:可以直接把之前的根控制器清空
#define KeyWindow [UIApplication sharedApplication].keyWindow

    KeyWindow.rootViewController = tabBarVc;

}

@end