思路
1.判断广告文件是否存在,以及初始化广告位
2.无论沙盒中是否存在广告图片,都需要重新调用获取广告接口,判断广告是否更新
3.异步下载图片,以及删除旧图片
4.广告页面的跳过按钮倒计时功能可以通过定时器或者GCD实现
5.为广告页面添加一个点击手势,跳转到广告页面
.h
#import <UIKit/UIKit.h>
NS_ASSUME_NONNULL_BEGIN
static NSString *const adImageName = @"adImageName";
typedef void(^TapBlock)(void);
@interface GLAdView : UIView
- (instancetype)initWithFrame:(CGRect)frame withTapBlock:(TapBlock)tapBlock;
/** 图片路径*/
@property (nonatomic, copy) NSString *filePath;
@end
NS_ASSUME_NONNULL_END
.m
#import "GLAdView.h"
@interface GLAdView()
@property (nonatomic, strong) UIImageView *adView;
@property (nonatomic, strong) UIButton *countBtn;
@property (nonatomic, strong) NSTimer *countTimer;
@property (nonatomic, assign) int count;
@property (nonatomic, copy) TapBlock tapBlock;
@end
// 广告显示的时间
static int const showtime = 5;
@implementation GLAdView
- (NSTimer *)countTimer
{
if (!_countTimer) {
_countTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(countDown) userInfo:nil repeats:YES];
}
return _countTimer;
}
- (instancetype)initWithFrame:(CGRect)frame withTapBlock:(TapBlock)tapBlock
{
if (self = [super initWithFrame:frame]) {
// 1.广告图片
_adView = [[UIImageView alloc] initWithFrame:frame];
_adView.userInteractionEnabled = YES;
_adView.contentMode = UIViewContentModeScaleAspectFill;
_adView.clipsToBounds = YES;
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(pushToAd)];
[_adView addGestureRecognizer:tap];
// 2.跳过按钮
CGFloat btnW = 60;
CGFloat btnH = 30;
_countBtn = [[UIButton alloc] initWithFrame:CGRectMake(KScreenWidth - btnW - 24, kTopHeight, btnW, btnH)];
[_countBtn addTarget:self action:@selector(dismiss) forControlEvents:UIControlEventTouchUpInside];
[_countBtn setTitle:[NSString stringWithFormat:@"跳过%d", showtime] forState:UIControlStateNormal];
_countBtn.titleLabel.font = [UIFont systemFontOfSize:15];
[_countBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
_countBtn.backgroundColor = [UIColor colorWithRed:38 /255.0 green:38 /255.0 blue:38 /255.0 alpha:0.6];
_countBtn.layer.cornerRadius = 4;
[self addSubview:_adView];
[self addSubview:_countBtn];
// 1.判断沙盒中是否存在广告图片,如果存在,直接显示
NSString *filePath = [self getFilePathWithImageName:[[NSUserDefaults standardUserDefaults] valueForKey:adImageName]];
BOOL isExist = [self isFileExistWithFilePath:filePath];
if (isExist) {// 图片存在
[self setFilePath:filePath];
self.tapBlock = tapBlock;
[self show];
}
// 2.无论沙盒中是否存在广告图片,都需要重新调用广告接口,判断广告是否更新
[self getAdvertisingImage];
}
return self;
}
- (void)setFilePath:(NSString *)filePath
{
_filePath = filePath;
_adView.image = [UIImage imageWithContentsOfFile:filePath];
}
- (void)pushToAd{
[self dismiss];
if (self.tapBlock) {
self.tapBlock();
}
}
- (void)countDown
{
_count --;
[_countBtn setTitle:[NSString stringWithFormat:@"跳过%d",_count] forState:UIControlStateNormal];
if (_count <= 0) {
[self dismiss];
}
}
- (void)show
{
// 倒计时方法2:定时器
if (showtime<=0) {
return;
}
[self startTimer];
UIWindow *window = [UIApplication sharedApplication].keyWindow;
[window addSubview:self];
}
// 定时器倒计时
- (void)startTimer
{
_count = showtime;
[[NSRunLoop mainRunLoop] addTimer:self.countTimer forMode:NSRunLoopCommonModes];
}
// 移除广告页面
- (void)dismiss
{
[self.countTimer invalidate];
self.countTimer = nil;
[UIView animateWithDuration:0.3f animations:^{
self.alpha = 0.f;
} completion:^(BOOL finished) {
[self removeFromSuperview];
}];
}
/**
* 判断文件是否存在
*/
- (BOOL)isFileExistWithFilePath:(NSString *)filePath
{
NSFileManager *fileManager = [NSFileManager defaultManager];
BOOL isDirectory = FALSE;
return [fileManager fileExistsAtPath:filePath isDirectory:&isDirectory];
}
/**
* 初始化广告页面
*/
- (void)getAdvertisingImage
{
NSArray *imageArray = @[@"http://img5.imgtn.bdimg.com/it/u=3300305952,1328708913&fm=26&gp=0.jpg", @"http://pic.58pic.com/58pic/13/82/74/92q58PICeSI_1024.jpg", @"http://pic25.nipic.com/20121205/10197997_003647426000_2.jpg"];
NSArray *stringArr = [imageUrl componentsSeparatedByString:@"/"];
NSString *imageName = stringArr.lastObject;
// 拼接沙盒路径
NSString *filePath = [self getFilePathWithImageName:imageName];
BOOL isExist = [self isFileExistWithFilePath:filePath];
if (!isExist){// 如果该图片不存在,则删除老图片,下载新图片
[self downloadAdImageWithUrl:imageUrl imageName:imageName];
}
}
/**
* 下载新图片
*/
- (void)downloadAdImageWithUrl:(NSString *)imageUrl imageName:(NSString *)imageName
{
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:imageUrl]];
UIImage *image = [UIImage imageWithData:data];
NSString *filePath = [self getFilePathWithImageName:imageName]; // 保存文件的名称
if ([UIImagePNGRepresentation(image) writeToFile:filePath atomically:YES]) {// 保存成功
DLog(@"广告页保存成功");
[self deleteOldImage];
[[NSUserDefaults standardUserDefaults] setValue:imageName forKey:adImageName];
[[NSUserDefaults standardUserDefaults] synchronize];
// 如果有广告链接,将广告链接也保存下来
}else{
DLog(@"广告页保存失败");
}
});
}
/**
* 删除旧图片
*/
- (void)deleteOldImage
{
NSString *imageName = [[NSUserDefaults standardUserDefaults] valueForKey:adImageName];
if (imageName) {
NSString *filePath = [self getFilePathWithImageName:imageName];
NSFileManager *fileManager = [NSFileManager defaultManager];
[fileManager removeItemAtPath:filePath error:nil];
}
}
/**
* 根据图片名拼接文件路径
*/
- (NSString *)getFilePathWithImageName:(NSString *)imageName
{
if (imageName) {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask, YES);
NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:imageName];
return filePath;
}
return nil;
}
@end
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