在大多数app启动过程中都会出现广告页，那么现在说说到底是如何实现的。
实现思路：
- 自定义一个广告页viewController（里面包含广告图及倒计时按钮），根据情况切换根控制器。
- 每次进入app默认将广告页控制器作为
self.window.rootViewController - 当点击跳过按钮或倒计时结束，
self.window.rootViewController切换为TabBarController； - 当点击图片时
self.window.rootViewController切换为TabBarController，并在主线程中发送通知让首页push到加载广告内容的webViewController中，当pop回来时回到首页。
注意点：
- 点击跳过按钮移除该view，进入首页
- 点击图片跳转到webView加载的视图中，此时可以返回到首页（这里发出通让首页控制器跳转到webView中）
- 没有网络时也会加载，此时我们要从本地取出上次加载的广告页图片及对应的url
- 倒数时间完成进入首页
- 关于通知的的发送与接收必须要保证在同一线程中
在这里我是用了Masonry SDWebImage这两个框架，具体作用你们都懂得。
在实际项目中我们会用AFN请求网络数据，并且封装成model使用，这里我就直接设置imageUrl了。。。
自定义广告页view
ZSCustomAdvertisementViewController.h
#import <UIKit/UIKit.h>
typedef void (^ CustomAdvertisementViewClickBlock)(void);
typedef void (^ CustomSkipButtonClickBlock)(void);
@interface ZSCustomAdvertisementViewController : UIViewController
///图片链接
@property (nonatomic,copy) NSString *imageUrl;
///持续时间
@property (nonatomic,assign) NSInteger duration;
///是否加载成功
@property (nonatomic,assign) BOOL isLoadSuccess;
///图片点击的block
@property (nonatomic,copy) CustomAdvertisementViewClickBlock imageClickBlock;
///跳过按钮的block
@property (nonatomic,copy) CustomSkipButtonClickBlock skipButtonClickBlock;
@end
ZSCustomAdvertisementViewController.m
#import "ZSCustomAdvertisementViewController.h"
#import "UIImageView+WebCache.h"
#import "Masonry.h"
@interface ZSCustomAdvertisementViewController ()
///广告图
@property (nonatomic,strong) UIImageView *advertisementImageView;
///倒计时
@property (nonatomic,strong) UIButton *skipButton;
///定时器
@property (nonatomic,strong) NSTimer *timer;
@end
@implementation ZSCustomAdvertisementViewController
#pragma mark -- 懒加载
- (UIImageView *)advertisementImageView {
if (_advertisementImageView == nil) {
_advertisementImageView = [[UIImageView alloc]initWithFrame:self.view.bounds];
[self.view addSubview:_advertisementImageView];
[_advertisementImageView sd_setImageWithURL:[NSURL URLWithString:self.imageUrl] placeholderImage:nil];
[_advertisementImageView sd_setImageWithURL:[NSURL URLWithString:self.imageUrl] placeholderImage:nil completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
[self downloadImage];
}];
_advertisementImageView.userInteractionEnabled = YES;
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(imageClickBlock:)];
[_advertisementImageView addGestureRecognizer:tap];
}
return _advertisementImageView;
}
- (UIButton *)skipButton {
if (_skipButton == nil) {
_skipButton = [UIButton buttonWithType:UIButtonTypeCustom];
_skipButton.layer.cornerRadius = 10;
_skipButton.clipsToBounds = YES;
_skipButton.layer.shouldRasterize = YES;
_skipButton.layer.rasterizationScale = [UIScreen mainScreen].scale;
[_skipButton setTitle:[NSString stringWithFormat:@"%zds跳过",self.duration] forState:UIControlStateNormal];
_skipButton.backgroundColor = [UIColor clearColor];
[_skipButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
_skipButton.layer.borderColor = [UIColor whiteColor].CGColor;
_skipButton.layer.borderWidth = 1;
[_skipButton addTarget:self action:@selector(countButtonClick) forControlEvents:UIControlEventTouchUpInside];
_timer = [NSTimer timerWithTimeInterval:1 target:self selector:@selector(countTime) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop]addTimer:_timer forMode:NSRunLoopCommonModes];
}
return _skipButton;
}
#pragma mark -- Action
///点击图片跳转webview
-(void)imageClickBlock:(UITapGestureRecognizer *)tap {
[self invalidatedTimer];
if (self.imageClickBlock) {
self.imageClickBlock();
}
}
///点击跳过按钮
- (void)countButtonClick {
if (self.skipButtonClickBlock) {
self.skipButtonClickBlock();
}
}
///定时器方法
- (void)countTime {
self.duration --;
[self.skipButton setTitle:[NSString stringWithFormat:@"%zds跳过",self.duration] forState:UIControlStateNormal];
if (self.duration <= 0) {
[self invalidatedTimer];
//切换根控制器
if (self.skipButtonClickBlock) {
self.skipButtonClickBlock();
}
return;
}
}
///销毁定时器
- (void)invalidatedTimer {
[_timer invalidate];
_timer = nil;
}
#pragma mark -- 下载图片到本地
- (void)downloadImage {
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString *imagePath = [path stringByAppendingPathComponent:@"currentImage.png"];
[UIImagePNGRepresentation(self.advertisementImageView.image) writeToFile:imagePath atomically:YES];
}
///获取沙盒中图片
- (UIImage *)getDocumentImage {
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString *imagePath = [path stringByAppendingPathComponent:@"currentImage.png"];
return [UIImage imageWithContentsOfFile:imagePath];
}
- (void)viewDidLoad {
[super viewDidLoad];
[self.advertisementImageView addSubview:self.skipButton];
[self.skipButton mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.mas_equalTo(80);
make.right.equalTo(self.advertisementImageView).offset(-30);
make.width.mas_equalTo(80);
make.height.mas_equalTo(40);
}];
}
在AppDelegate中
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];
self.window.backgroundColor = [UIColor whiteColor];
TabViewController *taVc = [[TabViewController alloc]init];
ZSCustomAdvertisementViewController *vc1 = [[ZSCustomAdvertisementViewController alloc]init];
self.window.rootViewController = vc1;
vc1.imageUrl = @"http://img06.tooopen.com/images/20171116/tooopen_sy_228521528924.jpg";
vc1.duration = 4;
vc1.skipButtonClickBlock = ^{
self.window.rootViewController = taVc;
};
//图片点击的block执行
vc1.imageClickBlock = ^{
self.window.rootViewController = taVc;
//这里尤为重要，要保证发送和接收方都在同一线程
dispatch_async(dispatch_get_main_queue(), ^{
[[NSNotificationCenter defaultCenter]postNotificationName:@"pushController" object:nil];
});
};
[self.window makeKeyAndVisible];
return YES;
}
最后在首页控制器的viewDidLoad中注册通知，并在通知方法中跳转控制器
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor blueColor];
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(pushController) name:@"pushController" object:nil];
self.title = @"首页";
}
- (void)pushController {
self.hidesBottomBarWhenPushed = YES;
SecondViewController *seVc = [[SecondViewController alloc]init];
[self.navigationController pushViewController:seVc animated:YES];
self.hidesBottomBarWhenPushed = NO;
}
效果图
广告页.gif
