iOS捕捉截屏事件并展示截图效果

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

[[nsnotificationcenter defaultcenter] addobserver:self

selector:@selector(getscreenshot:)

name:uiapplicationuserdidtakescreenshotnotification object:nil];

截屏后捕捉到事件：

- (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：

iOS捕捉截屏事件并展示截图效果

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