"iOS Development-data transfer" About two controller jump data transfer

Forward delivery

When a controller switches to the next control, this time the data is passed forward, so only need to jump before the execution of a method on the line.

/*就是执行控制器跳转之间的那条线之前做的方法*/- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{    // 1.取得目标控制器    UIViewController *contactVc = segue.destinationViewController;    // 2.设置标题    contactVc.title = [NSString stringWithFormat:@"%@的联系人列表"self.accountField.text];}

Reverse Delivery

When a controller needs to switch to his last controller, it needs to use proxy mode when passing data to the previous controller.

Suppose control B is going to transfer the data to the previous controller A

A proxy agreement is declared in B

@protocol MJEditViewControllerDelegate <NSObject>@optional//A要执行的方法，B会把数据传递给设个方法，A实现这个方法设置自己的数据,@end

A adhere to this protocol, then implement the method in the protocol, then set its agent to a in B

b Get the data ready, then notify his agent A.

 //2. Notification Agent    if([ Self. DelegateRespondstoselector:@selector(Proxy method:)]) {//Update model data         Self. Contact. Name= Self. NameField. Text; Self. Contact. Phone= Self. Phonefield. Text; [ Self. DelegateEditviewcontroller: SelfDidsavecontact: Self. Contact]; }

"iOS Development-data transfer" About two controller jump data transfer