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
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[[nsnotificationcenter defaultcenter] addobserver:self
selector:@selector(getscreenshot:)
name:uiapplicationuserdidtakescreenshotnotification object:nil];
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截屏后捕捉到事件：
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- (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];
});
}
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获取截屏图片data：
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- (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);
}
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按钮点击事件：
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-(void)sharebtn:(uibutton *)sender{
/*
分享代码
*/
}
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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