- (void)applicationDidEnterBackground:(UIApplication *)application
{
//进入后台,取消一切键盘响应(循环两层,)
NSArray *windows = [[UIApplication sharedApplication] windows];
UIWindow *mainWindow = [windows objectAtIndex:0];
for (UIView * subView in mainWindow.subviews) {
[subView endEditing:NO];
for (UIView * subSubView in subView.subviews) {
[subSubView endEditing:NO];
}
}
}
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