IOS Uitextfield Usage Introduction

Commissioned

1. Going to start editing

-(BOOL) textfieldshouldbeginediting: (Uitextfield *) TextField

{

return YES;

}

2.

-(void) textfielddidbeginediting: (Uitextfield *) textfield{    //triggered when editing starts, text field will become first responder}3.-(BOOL) textfieldshouldendediting: (Uitextfield *) textfield{    //returns a BOOL value, Specifies whether the text field is allowed to end editing, and when the edit is finished, the text field yields first responder    //to prevent the text field from disappearing when the user finishes editing, you can return no     //This is useful for programs where text fields must always remain active, such as instant messaging     return NO;  4.-(BOOL) TextField: (uitextfield*) TextField Shouldchangecharactersinrange: (nsrange) Range replacementstring :(NSString *) string{    //This method is called when the user uses the AutoCorrect feature to modify the input text to the recommended text.     //This is especially useful for applications that want to join the Undo option     //can track the last modification made in a field, or log records of all edits for auditing purposes.       //to prevent text from being changed you can return no    //this method has a Nsrange object that indicates the position of the changed text , it is suggested that the modified text is also in which     return YES;} 5.-(BOOL) Textfieldshouldclear: (Uitextfield *) textfield{    //returns a BOOL value indicating whether to allow content to be purged based on user request     //can be set in a specificAllow the content to be cleared     return YES;} 6.-(BOOL) Textfieldshouldreturn: (Uitextfield *) textfield{    //returns a BOOL value indicating whether the edit is allowed to end when the ENTER key is pressed     //If you allow the Resignfirstresponder method to be called, this causes the end of the edit, and the keyboard is closed     [textfield resignfirstresponder];//check resign The meaning of this word to understand this method     return YES;}   To set up a proxy:mytextfield.delegate=self;

IOS Uitextfield Usage Introduction