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分分钟解决iOS开发中App启动广告的功能

投稿文章，作者：Bison（微博）

前不久有朋友需要一个启动广告的功能，我说网上有挺多的，他说，看的不是很理想。想让我写一个，于是乎，抽空写了一个，代码通俗易懂，简单的封装了一下，各种事件用block回调的，有俩种样式的广告，一种是全屏广告，另一种是下面露logo的，类似网页新闻的启动广告。依赖SDWebImage主要用来下载网络的广告图片，一般项目里面网络图片都用的这个框架，所以在此不做过多的阐述。下面让我们来看看我封装的过程，对于新手来说，可以学习一下这种封装的思想。

1.首先建一个继承View的LBLaunchImageAdView.h文件，代码如下：

//  LBLaunchImageAdView.h //  LBLaunchImageAd //  Created by gold on 16/6/8. //  Copyright  2016年 Bison. All rights reserved. typedef enum {     FullScreenAdType = 1,//全屏的广告     LogoAdType = 0,//带logo的广告 }AdType; #import  #import "UIImageView+WebCache.h" #define mainHeight      [[UIScreen mainScreen] bounds].size.height #define mainWidth       [[UIScreen mainScreen] bounds].size.width typedef void (^LBClick) (NSInteger tag); @interface LBLaunchImageAdView : UIView @property (strong, nonatomic) UIImageView *aDImgView; @property (strong, nonatomic) UIWindow *window; @property (assign, nonatomic) NSInteger adTime; //倒计时总时长,默认6秒 @property (strong, nonatomic) UIButton *skipBtn; @property (nonatomic, copy)LBClick clickBlock; - (instancetype)initWithWindow:(UIWindow *)window andType:(NSInteger)type andImgUrl:(NSString *)url; @end

里面主要重写了init方法，init方法方便我们在调用封装的类初始化时传递一些参数，在此，我只传递了三个必要的参数，其他参数都用@property属性来调配，达到自己想要的效果，再有就是一个block的回调函数，主要处理各种事件。下面我们看看.m文件里面实现的部分

//  LBLaunchImageAdView.m //  LBLaunchImageAd //  Created by gold on 16/6/8. //  Copyright 2016年 Bison. All rights reserved. #import "LBLaunchImageAdView.h" @interface LBLaunchImageAdView() {     NSTimer *countDownTimer; } @property (strong, nonatomic) NSString *isClick; @property (assign, nonatomic) NSInteger secondsCountDown; //倒计时总时长 @end @implementation LBLaunchImageAdView - (instancetype)initWithWindow:(UIWindow *)window andType:(NSInteger)type andImgUrl:(NSString *)url {     self = [super init];     if (self) {         self.window = window;         _secondsCountDown = 0;         [window makeKeyAndVisible];         //获取启动图片         CGSize viewSize = window.bounds.size;         //横屏请设置成 @"Landscape"         NSString *viewOrientation = @"Portrait";         NSString *launchImageName = nil;         NSArray* imagesDict = [[[NSBundle mainBundle] infoDictionary] valueForKey:@"UILaunchImages"];         for (NSDictionary* dict in imagesDict)         {             CGSize imageSize = CGSizeFromString(dict[@"UILaunchImageSize"]);             if (CGSizeEqualToSize(imageSize, viewSize) && [viewOrientation isEqualToString:dict[@"UILaunchImageOrientation"]])             {                 launchImageName = dict[@"UILaunchImageName"];             }         }         UIImage * launchImage = [UIImage imageNamed:launchImageName];         self.backgroundColor = [UIColor colorWithPatternImage:launchImage];         self.frame = CGRectMake(0, 0, mainWidth, mainHeight);         if (type == FullScreenAdType) {             self.aDImgView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, mainWidth, mainHeight)];         }else{             self.aDImgView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, mainWidth, mainHeight - mainWidth/3)];         }         self.skipBtn = [UIButton buttonWithType:UIButtonTypeCustom];         self.skipBtn.frame = CGRectMake(mainWidth - 70, 20, 60, 30);         self.skipBtn.backgroundColor = [UIColor brownColor];         self.skipBtn.titleLabel.font = [UIFont systemFontOfSize:14];         [self.skipBtn addTarget:self action:@selector(skipBtnClick) forControlEvents:UIControlEventTouchUpInside];         [self.aDImgView addSubview:self.skipBtn];         UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:self.skipBtn.bounds byRoundingCorners:UIRectCornerBottomRight | UIRectCornerTopRight cornerRadii:CGSizeMake(15, 15)];         CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];         maskLayer.frame = self.skipBtn.bounds;         maskLayer.path = maskPath.CGPath;         self.skipBtn.layer.mask = maskLayer;         SDWebImageManager *manager = [SDWebImageManager sharedManager];         [manager downloadImageWithURL:[NSURL URLWithString:url] options:0 progress:^(NSInteger receivedSize, NSInteger expectedSize) {         } completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {             if (image) {                  [self.aDImgView setImage:[self imageCompressForWidth:image targetWidth:mainWidth]];             }         }];         self.aDImgView.tag = 1101;         self.aDImgView.backgroundColor = [UIColor redColor];         [self addSubview:self.aDImgView];         UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(activiTap:)];         // 允许用户交互         self.aDImgView.userInteractionEnabled = YES;         [self.aDImgView addGestureRecognizer:tap];         CABasicAnimation *opacityAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];         opacityAnimation.duration = 0.8;         opacityAnimation.fromValue = [NSNumber numberWithFloat:0.0];         opacityAnimation.toValue = [NSNumber numberWithFloat:0.8];         opacityAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];         [self.aDImgView.layer addAnimation:opacityAnimation forKey:@"animateOpacity"];         countDownTimer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(onTimer) userInfo:nil repeats:YES];         [self.window addSubview:self];     }     return self; } #pragma mark - 点击广告 - (void)activiTap:(UITapGestureRecognizer*)recognizer{     _isClick = @"1";     [self startcloseAnimation]; } #pragma mark - 开启关闭动画 - (void)startcloseAnimation{     CABasicAnimation *opacityAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];     opacityAnimation.duration = 0.5;     opacityAnimation.fromValue = [NSNumber numberWithFloat:1.0];     opacityAnimation.toValue = [NSNumber numberWithFloat:0.3];     opacityAnimation.removedOnCompletion = NO;     opacityAnimation.fillMode = kCAFillModeForwards;     [self.aDImgView.layer addAnimation:opacityAnimation forKey:@"animateOpacity"];     [NSTimer scheduledTimerWithTimeInterval:opacityAnimation.duration                                      target:self                                    selector:@selector(closeAddImgAnimation)                                    userInfo:nil                                     repeats:NO]; } - (void)skipBtnClick{     _isClick = @"2";     [self startcloseAnimation]; } #pragma mark - 关闭动画完成时处理事件 -(void)closeAddImgAnimation {     [countDownTimer invalidate];     countDownTimer = nil;     self.hidden = YES;     self.aDImgView.hidden = YES;     self.hidden = YES;     if ([_isClick integerValue] == 1) {         if (self.clickBlock) {//点击广告             self.clickBlock(1100);         }     }else if([_isClick integerValue] == 2){         if (self.clickBlock) {//点击跳过             self.clickBlock(1101);         }     }else{         if (self.clickBlock) {//点击跳过             self.clickBlock(1102);         }     } } - (void)onTimer {     if (_adTime == 0) {         _adTime = 6;     }     if (_secondsCountDown < _adTime) {         _secondsCountDown++;         [self.skipBtn setTitle:[NSString stringWithFormat:@"%ld | 跳过",_secondsCountDown] forState:UIControlStateNormal];     }else{         [countDownTimer invalidate];         countDownTimer = nil;         [self startcloseAnimation];     } } #pragma mark - 指定宽度按比例缩放 - (UIImage *)imageCompressForWidth:(UIImage *)sourceImage targetWidth:(CGFloat)defineWidth {     UIImage *newImage = nil;     CGSize imageSize = sourceImage.size;     CGFloat width = imageSize.width;     CGFloat height = imageSize.height;     CGFloat targetWidth = defineWidth;     CGFloat targetHeight = height / (width / targetWidth);     CGSize size = CGSizeMake(targetWidth, targetHeight);     CGFloat scaleFactor = 0.0;     CGFloat scaledWidth = targetWidth;     CGFloat scaledHeight = targetHeight;     CGPoint thumbnailPoint = CGPointMake(0.0, 0.0);     if(CGSizeEqualToSize(imageSize, size) == NO){         CGFloat widthFactor = targetWidth / width;         CGFloat heightFactor = targetHeight / height;         if(widthFactor > heightFactor){             scaleFactor = widthFactor;         }         else{             scaleFactor = heightFactor;         }         scaledWidth = width * scaleFactor;         scaledHeight = height * scaleFactor;         if(widthFactor > heightFactor){             thumbnailPoint.y = (targetHeight - scaledHeight) * 0.5;         }else if(widthFactor < heightFactor){             thumbnailPoint.x = (targetWidth - scaledWidth) * 0.5;         }     }     //    UIGraphicsBeginImageContext(size);     UIGraphicsBeginImageContextWithOptions(size, NO, [UIScreen mainScreen].scale);     CGRect thumbnailRect = CGRectZero;     thumbnailRect.origin = thumbnailPoint;     thumbnailRect.size.width = scaledWidth;     thumbnailRect.size.height = scaledHeight;     [sourceImage drawInRect:thumbnailRect];     newImage = UIGraphicsGetImageFromCurrentImageContext();     if(newImage == nil){         NSLog(@"scale image fail");     }     UIGraphicsEndImageContext();     return newImage; } @end

UI部分由于没有什么需要重用的地方，所以没有再另外抽取出来方法，全部放在init方法里面，显得有点臃肿。UI部分在此不做过多的阐述，里边主要运用了一个渐变的动画，利用CABasicAnimation中的opacity,有兴趣的朋友可以看看源码，再有就是一个图片重构的方法，防止图片变形。

下面我们说下怎么集成我封装的这个功能吧，挺简单的，首先来看看代码：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {     /* FullScreenAdType 全屏广告      * LogoAdType 带logo的广告类似网易广告，值得注意的是启动图片必须带logo图      * ImgUrl  图片url      */     LBLaunchImageAdView * adView = [[LBLaunchImageAdView alloc]initWithWindow:self.window andType:LogoAdType andImgUrl:@"http://www.uisheji.com/wp-content/uploads/2013/04/19/app-design-uisheji-ui-icon20121_55.jpg"];     //各种回调     adView.clickBlock = ^(NSInteger tag){         switch (tag) {             case 1100:{                 NSLog(@"点击广告回调");                 TestViewController *vc = [[TestViewController alloc]init];                 vc.view.backgroundColor = [UIColor whiteColor];                 [self.window.rootViewController presentViewController:vc animated:YES completion:^{                 }];             }                 break;             case 1101:                 NSLog(@"点击跳过回调");                 break;             case 1102:                 NSLog(@"倒计时完成后的回调");                 break;             default:                 break;         }     };     return YES; }

首先在AppDelegate.m导入头文件#import "LBLaunchImageAdView.h"，然后在didFinishLaunchingWithOptions方法里面初始化一下，最后就是一些点击的回调事件了。到此，讲解完毕，最后丢上效果图和下载地址。

分分钟解决iOS开发中App启动广告的功能