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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=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
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原文地址：http://www.cnblogs.com/fengmin/p/5642284.html
