分分钟解决iOS开发中App启动广告的功能

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=8

typedef 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.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

//  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：

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。

动图

下载地址

https://github.com/AllLuckly/LBLaunchImageAd