UITextField代理详解
第一继承自UIControl
添加事件
[textFieldaddTarget:selfaction:@selector(didDone:)forControlEvents:UIControlEventEditingDidEndOnExit];
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField; // return NO to disallow editing.
返回值是true或false
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
NSLog(@"textFieldShouldBeginEditing");
return YES;
}
- (void)textFieldDidBeginEdiUITextField *)textField; // became first responder
此时已变成第一响应者
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField
{
NSLog(@"textFieldDidBeginEditing");
return YES;
}
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField; // return YES to allow editing to stop and to resign first responder status. NO to disallow the editing session to end
编辑完之后，键盘放弃第一响应者
- (void)textFieldDidEndEditing:(UITextField *)textField; // may be called if forced even if shouldEndEditing returns NO (e.g. view removed from window) or endEditing:YES called
输入结束之后调用
- (void)textFieldDidEndEditing:(UITextField *)textField
{
NSLog(@"textFieldDidEndEditing");
}
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string; // return NO to not change text
通过每次输入的内容，返回YES，则会在textField做显示，否则不显示
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
NSLog(@"the input char is %@",string);
return YES;
}
- (BOOL)textFieldShouldClear:(UITextField *)textField; // called when clear button pressed. return NO to ignore (no notifications)
如果返回值是NO ,则点击clear不会清除
- (BOOL)textFieldShouldClear:(UITextField *)textField
{
NSLog(@"textFieldShouldClear");
return NO;
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField; // called when 'return' key pressed. return NO to ignore
点击return 钮之后，是否仍然显示
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{// called when 'return' key pressed. return NO to ignore.
return NO;
}
