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 = ; i < DLNewfeatureImageCount; i ++) {
//2.1
UIImageView *imgView = [[UIImageView alloc]initWithFrame:CGRectMake(i*imageW, , imageW, imageH)];
if (i == ) {
imgView.backgroundColor = [UIColor redColor];
}
if (i == ) {
imgView.backgroundColor = [UIColor greenColor];
}
if (i == ) {
imgView.backgroundColor = [UIColor blueColor]; [self setupLastImageView:imgView];
} [scrollView addSubview:imgView]; } scrollView.contentSize = CGSizeMake(DLNewfeatureImageCount * imageW, );
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-);
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(, imgView.frame.size.height-, imgView.frame.size.width, );
[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。