Use block to implement value transfer between two pages, and block to implement two pages

Use block to implement value transfer between two pages, and block to implement two pages

The second view declares a block attribute:

@ Property (nonatomic, copy) void (^ doTransferMsg) (NSString * _ msg );

Then, check whether the block exists in the value passing method.

-(IBAction) transferText :( UIButton *) sender {
If (_ doTransferMsg ){
_ DoTransferMsg (@ "hello there ");
_ DoTransferMsg = nil;
}
[Self. navigationController popViewControllerAnimated: YES];
}

In the main View, this block is implemented by the way when the second view is created.

-(IBAction) LoadDetailView :( UIButton *) sender {
[IbTextLabel setText: nil];
DetailViewController * _ curDetail = [[DetailViewController alloc] initWithNibName: @ "DetailViewController"
Bundle: nil];
[_ CurDetail setDoTransferMsg: ^ (NSString * _ msg ){
Dispatch_async (dispatch_get_main_queue (), ^ {
[IbTextLabel setText: _ msg];
});
}];
[Self. navigationController pushViewController: _ curDetail
Animated: YES];
[_ CurDetail release];
}

That's all

JavaScript value transfer between two pages

----- Directly use jsp to upload the file -----
A page needs to be passed with Parameters
B. jsp? A_name =$ {a_name}

Page B
<%
String B _name = request. getParameter ("a_name ");
%>

Value = <% = B _name %>

Pass value between two pages

Use window. open ()
Parent page:
Var child = window. open ("child. aspx "," child "," height = 200, width = 400, status = yes, toolbar = no, menubar = no, location = no ");
<Input type = "hidden" name = "hdvalue" id = "hdvalue">
Subpage:
Optional values opener.doc ument. getElementById ("hdvalue"). value = "value ";
When the page is closed, the above js