iOS截屏並修改截圖而後分享的功能實現

一. 實現的效果相似微博的截圖分享

不只截圖分享的時候還進行圖片的修改,增長本身的二維碼

二.實現方式

蘋果在ios7以後提供了一個新的通知類型：UIApplicationUserDidTakeScreenshotNotification，

這個通知會告知註冊了此通知的對象已經發生了截屏事件，而後咱們就能夠在這個事件中實現本身的邏輯

1.註冊通知

- (void)viewDidLoad {
    [super viewDidLoad];
    //註冊用戶的截屏操做通知
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(userDidTakeScreenshot:)
                                                 name:UIApplicationUserDidTakeScreenshotNotification object:nil];
}

2.接收通知 (獲取截圖並修改的圖片,並展現,展現UI,能夠本身修改)

//截屏響應
- (void)userDidTakeScreenshot:(NSNotification *)notification
{
    NSLog(@"檢測到截屏");
    
    //人爲截屏, 模擬用戶截屏行爲, 獲取所截圖片
    _testImg = [self imageWithScreenshot];
    
    
//    //添加顯示
    UIImageView *imgvPhoto = [[UIImageView alloc]initWithImage:_testImg];
    imgvPhoto.frame = CGRectMake(0, WIN_HEIGHT/2, WIN_WIDTH/2, WIN_HEIGHT/2);
    imgvPhoto.backgroundColor = [UIColor orangeColor];
    imgvPhoto.userInteractionEnabled = YES;
    //添加邊框
    CALayer * layer = [imgvPhoto layer];
    layer.borderColor = [[UIColor whiteColor] CGColor];
    layer.borderWidth = 5.0f;
    //添加四個邊陰影
    imgvPhoto.layer.shadowColor = [UIColor blackColor].CGColor;
    imgvPhoto.layer.shadowOffset = CGSizeMake(0, 0);
    imgvPhoto.layer.shadowOpacity = 0.5;
    imgvPhoto.layer.shadowRadius = 10.0;
    //添加兩個邊陰影
    imgvPhoto.layer.shadowColor = [UIColor blackColor].CGColor;
    imgvPhoto.layer.shadowOffset = CGSizeMake(4, 4);
    imgvPhoto.layer.shadowOpacity = 0.5;
    imgvPhoto.layer.shadowRadius = 2.0;
    
    [self.view  addSubview:imgvPhoto];
    
    // 添加手勢
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapImgView:)];
    [imgvPhoto addGestureRecognizer:tap];
}

3. 截圖並修改圖片

/**
 *  截取當前屏幕 並修改
 *
 *  @return NSData *
 */
- (UIImage *)imageWithScreenshot
{
    CGSize imageSize = CGSizeZero;
    UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
    if (UIInterfaceOrientationIsPortrait(orientation))
        imageSize = [UIScreen mainScreen].bounds.size;
    else
        imageSize = CGSizeMake([UIScreen mainScreen].bounds.size.height, [UIScreen mainScreen].bounds.size.width);
    
    UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0);
    CGContextRef context = UIGraphicsGetCurrentContext();
    for (UIWindow *window in [[UIApplication sharedApplication] windows])
    {
        CGContextSaveGState(context);
        CGContextTranslateCTM(context, window.center.x, window.center.y);
        CGContextConcatCTM(context, window.transform);
        CGContextTranslateCTM(context, -window.bounds.size.width * window.layer.anchorPoint.x, -window.bounds.size.height * window.layer.anchorPoint.y);
        if (orientation == UIInterfaceOrientationLandscapeLeft)
        {
            CGContextRotateCTM(context, M_PI_2);
            CGContextTranslateCTM(context, 0, -imageSize.width);
        }else if (orientation == UIInterfaceOrientationLandscapeRight)
        {
            CGContextRotateCTM(context, -M_PI_2);
            CGContextTranslateCTM(context, -imageSize.height, 0);
        } else if (orientation == UIInterfaceOrientationPortraitUpsideDown) {
            CGContextRotateCTM(context, M_PI);
            CGContextTranslateCTM(context, -imageSize.width, -imageSize.height);
        }
        if ([window respondsToSelector:@selector(drawViewHierarchyInRect:afterScreenUpdates:)])
        {
            [window drawViewHierarchyInRect:window.bounds afterScreenUpdates:YES];
        }
        else
        {
            [window.layer renderInContext:context];
        }
        CGContextRestoreGState(context);
    }
    
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    // 修改圖片
    NSData *imageData = UIImagePNGRepresentation(image);
    UIImage *LastImage = [UIImage imageWithData:imageData];
    
    UIImage *img = [UIImage imageNamed:@"ico_nursery.png"];
    CGImageRef imgRef = img.CGImage;
    CGFloat w = CGImageGetWidth(imgRef);
    CGFloat h = CGImageGetHeight(imgRef);
    
    //以1.png的圖大小爲底圖
    UIImage *img1 = LastImage;
    CGImageRef imgRef1 = img1.CGImage;
    CGFloat w1 = CGImageGetWidth(imgRef1);
    CGFloat h1 = CGImageGetHeight(imgRef1);
    
    //以1.png的圖大小爲畫布建立上下文
    UIGraphicsBeginImageContext(CGSizeMake(w1, h1 + 100));
    [img1 drawInRect:CGRectMake(0, 0, w1, h1)];//先把1.png 畫到上下文中
    [img drawInRect:CGRectMake(10, h1 + 10, 80, 80)];//再把小圖放在上下文中
    UIImage *resultImg = UIGraphicsGetImageFromCurrentImageContext();//從當前上下文中得到最終圖片
    UIGraphicsEndImageContext();//關閉上下文
    
    return  resultImg;
}

4.根據添加的事件進行分享 分享本身也可封裝

// 點擊圖片改變imageView位置,打印圖片信息  分享本身也可封裝
- (void)tapImgView: (UITapGestureRecognizer *)tap {
    
    NSLog(@"點擊了圖片...");
 // 微信
    [MyAPIClient mobEvent:@"wechat"];
//  [Helper shareImageName:_testImg type:SSDKPlatformSubTypeWechatSession];//  微信好友
    [Helper shareImageName:_testImg type:SSDKPlatformSubTypeWechatTimeline];// 微信朋友圈
// QQ
//    [MyAPIClient mobEvent:@"QQ"];
//    [Helper shareImageName:_testImg type:SSDKPlatformTypeQQ];// QQ
    
}

5. 移除通知

- (void)dealloc
{
    [[NSNotificationCenter defaultCenter]removeObserver:self];
}

這樣就能夠了.展現一下測試

自身截圖

截圖修改分享圖

 

ok,結束,須要補充的,歡迎你們留言討論!