iOS中的项目新特性页面的处理

一般项目中都会出现新特性页面，比如第一次使用应用的时候，或者在应用设置里查看新特性的时候会出现。

这里，选择新建一个专门处理项目新特性的控制器，来完成功能。

首先是

NewFeaturesViewController.h

#import <UIKit/UIKit.h>

typedef enum : NSInteger{
    NewfeatureTypeFromeSetting,     //从设置界面进入该页
    NewfeatureTypeFromeWelcom,      //第一次安装的时候进入
} NewFeatureType;

@interface NewFeaturesViewController : UIViewController

@property (nonatomic,assign) NewFeatureType newfeaturetype;

@end

NewFeaturesViewController.m

#import "NewFeaturesViewController.h"
#import "ViewController.h"

#define DLNewfeatureImageCount 3

@interface NewFeaturesViewController ()<UIScrollViewDelegate>

@property (nonatomic,weak) UIPageControl *pageControl;

@end

@implementation NewFeaturesViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    [UIApplication sharedApplication].statusBarHidden = YES;
    
    [self setupScrollView];
    [self setupPageControl];
    
}

-(void)setupScrollView{
    //1.
    UIScrollView *scrollView = [[UIScrollView alloc]init];
    scrollView.frame = self.view.bounds;
    scrollView.bounces = NO;
    scrollView.delegate = self;
    [self.view addSubview:scrollView];
    
    //2.
    CGFloat imageW = scrollView.bounds.size.width;
    CGFloat imageH = scrollView.bounds.size.height;
    for (int i = 0; i < DLNewfeatureImageCount;  i ++) {
        //2.1
        UIImageView *imgView = [[UIImageView alloc]initWithFrame:CGRectMake(i*imageW, 0, imageW, imageH)];
        if (i == 0) {
            imgView.backgroundColor = [UIColor redColor];
        }
        if (i == 1) {
            imgView.backgroundColor = [UIColor greenColor];
        }
        if (i == 2) {
            imgView.backgroundColor = [UIColor blueColor];
            
            [self setupLastImageView:imgView];
        }
        
        [scrollView addSubview:imgView];
        
    }
    
    scrollView.contentSize = CGSizeMake(DLNewfeatureImageCount * imageW, 0);
    scrollView.pagingEnabled = YES;
    
}

-(void)setupPageControl{
    UIPageControl *pageC = [[UIPageControl alloc]init];
    pageC.center = CGPointMake(self.view.frame.size.width*0.5, self.view.frame.size.height-20);
    pageC.numberOfPages = DLNewfeatureImageCount;
    [self.view addSubview:pageC];
    self.pageControl = pageC;
    
}

-(void)setupLastImageView:(UIImageView *)imgView{
    imgView.userInteractionEnabled = YES;
    UIButton *startButton = [[UIButton alloc] init];
    startButton.frame = CGRectMake(0, imgView.frame.size.height-50, imgView.frame.size.width, 30);
    [imgView addSubview:startButton];
    [startButton addTarget:self action:@selector(start) forControlEvents:UIControlEventTouchUpInside];
    [startButton setTitle:@"立即开始" forState:UIControlStateNormal];
}

-(void)start{
    [UIApplication sharedApplication].statusBarHidden = NO;
    
    //判断类型
    if (self.newfeaturetype == NewfeatureTypeFromeWelcom) {
        
    }else{
    
    }
    
    ViewController *vc = [[ViewController alloc]init];
    //切换控制器
    UIWindow *window = [UIApplication sharedApplication].keyWindow;
    window.rootViewController = vc;
    
}

-(void)scrollViewDidScroll:(UIScrollView *)scrollView{
    //1.
    CGFloat doublePage = scrollView.contentOffset.x / scrollView.frame.size.width;
    int intpage = (int)(doublePage + 0.5);
    NSLog(@"%d",intpage);
    self.pageControl.currentPage = intpage;
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end

使用方法：

在AppDelegate中，将self.window.rootViewController 设置为本类，在点击“立即开始”按钮后，切换控制器为主体控制器。