摩拜单车、微信的截屏就做的比较人性化。
现在很多app开始支持用户截屏后，主动获取截图并弹出分享视图，这样用户就不用去相册去找了，感觉体验不错，今天就分享一下 截屏开发的心得，希望能帮助ios的朋友。
ios7之后，苹果开放出一个通知：uiapplicationuserdidtakescreenshotnotification，截屏时系统就会发出这个通知，需要你注册这个通知，就能捕捉到截屏图片。
下面的代码，实现的是用户截屏后，捕获到截屏图片，展示出来：
//注册截屏通知
|
1
2
3
|
[[nsnotificationcenter defaultcenter] addobserver:self selector:@selector(getscreenshot:) name:uiapplicationuserdidtakescreenshotnotification object:nil]; |
截屏后捕捉到事件：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
- (void)getscreenshot:(nsnotification *)notification{ nslog(@"捕捉截屏事件"); //获取截屏图片 uiimage *image = [uiimage imagewithdata:[self imagedatascreenshot]]; //显示图片 uiimageview *imgv = [[uiimageview alloc]initwithimage:image]; imgv.frame = [uiscreen mainscreen].bounds; uiview *backview = [[uiview alloc]initwithframe:cgrectmake(0, 0, screen_width, screen_height)]; backview.backgroundcolor = [[uicolor graycolor] colorwithalphacomponent:0.8]; uibutton *sharebtn = [uibutton buttonwithtype:uibuttontypesystem]; sharebtn.titlelabel.font = [uifont systemfontofsize:17.0]; [sharebtn settintcolor:[uicolor whitecolor]]; sharebtn.frame = cgrectmake(screen_width/5,screen_height ,screen_width*3/5,50); [sharebtn.layer setmaskstobounds:yes]; [sharebtn.layer setborderwidth:1]; sharebtn.layer.cornerradius = 6; [sharebtn settitle:@"分享给好友" forstate:uicontrolstatenormal]; sharebtn.backgroundcolor = [soufunimutilityhelper colorwithhexstring:@"#b22222"]; [sharebtn addtarget:self action:@selector(sharebtn:) forcontrolevents:uicontroleventtouchupinside]; [backview addsubview:imgv]; [backview addsubview:sharebtn]; uiwindow *window = [uiapplication sharedapplication].keywindow; [window addsubview:backview]; [uiview animatewithduration:1.0 animations:^{ imgv.transform = cgaffinetransformmakescale(0.8, 0.8); sharebtn.transform = cgaffinetransformmaketranslation(0, -50); }]; //3秒后消失 dispatch_after(dispatch_time(dispatch_time_now, (int64_t)(3 * nsec_per_sec)), dispatch_get_main_queue(), ^{ [backview removefromsuperview]; });} |
获取截屏图片data：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
|
- (nsdata *)imagedatascreenshot{ cgsize imagesize = cgsizezero; imagesize = [uiscreen mainscreen].bounds.size; 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 ([window respondstoselector:@selector(drawviewhierarchyinrect:afterscreenupdates:)]) { [window drawviewhierarchyinrect:window.bounds afterscreenupdates:yes]; } else { [window.layer renderincontext:context]; } cgcontextrestoregstate(context); } uiimage *image = uigraphicsgetimagefromcurrentimagecontext(); uigraphicsendimagecontext(); return uiimagepngrepresentation(image);} |
按钮点击事件：
|
1
2
3
4
5
6
|
-(void)sharebtn:(uibutton *)sender{/* 分享代码 */} |
以上就是截屏后的事例代码，最后附上效果图：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/SL_ideas/article/details/73332058
