分分钟解决iOS开发中App启动广告的功能

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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//  技术交流群：534926022（免费） 511040024(0.8/人付费)//  Created by gold on 16/6/8.//  Copyright © 2016年 Bison. All rights reserved.//  iOS开发学习app下载https://itunes.apple.com/cn/app/it-blog-for-ios-developers/id1067787090?mt=8typedef enum {    FullScreenAdType = 1,//全屏的广告    LogoAdType = 0,//带logo的广告}AdType;#import <UIKit/UIKit.h>#import "UIImageView+WebCache.h"#define mainHeight      [[UIScreen mainScreen] bounds].size.height#define mainWidth       [[UIScreen mainScreen] bounds].size.widthtypedef 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//  技术交流群：534926022（免费） 511040024(0.8/人付费)//  Created by gold on 16/6/8.//  Copyright © 2016年 Bison. All rights reserved.//  iOS开发学习app下载https://itunes.apple.com/cn/app/it-blog-for-ios-developers/id1067787090?mt=8#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。

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下载地址-------戳这里

转自：http://www.jianshu.com/p/10c35dfc0a4a