我正在学习obj-c,并给自己一个简单的任务,创建一个具有2个uitextfields
,label
和button
的应用程序(按钮汇总2个数字并在标签中显示结果)。我做了这个应用程序,但我还没有弄清楚如何使textfields
与"完成"按钮和"仅数字"一起交互。
下面是我的代码:
#import UIKit/UIKit.h
@interface ViewController : UIViewController
@property IBOutlet UILabel *label;
@property IBOutlet UITextField *textField1;
@property IBOutlet UITextField *textField2;
@property NSInteger textFieldInt1, textFieldInt2;
@property NSString *textFieldStr1, *textFieldStr2;
-(IBAction)button:(id)sender;
-(IBAction)hideKeyboard:(id)sender;
@end
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
@synthesize label, textField1, textField2, textFieldInt1, textFieldInt2, textFieldStr1, textFieldStr2;
-(IBAction)button:(id)sender {
textFieldInt1=[textField1.text integerValue];
textFieldInt2=[textField2.text integerValue];
label.text=[NSString stringWithFormat: @"%d", textFieldInt1+textFieldInt2];
[self.view endEditing:YES];
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self.textField1 setReturnKeyType:UIReturnKeyDone];
[self.textField2 setReturnKeyType:UIReturnKeyDone];
}
-(IBAction)hideKeyboard:(id)sender
{
[self.view endEditing:YES];
}
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
if(![string intValue] && ![string isEqualToString:@""] && ![string isEqualToString:@"0"])
{
return NO;
} else {
return YES;
}
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
[self.view endEditing:YES];
[super touchesBegan:touches withEvent:event];
}
@end
此外,我(在故事板中)将textFields
连接到hideKeyboard (didEndOnExit)
,button
连接到button (touchUpInside)
和所有出口(textfields
,button
,label
)。
问题是:numbers only
输入不适用于done
。如果我使用delegate
(连接到两个textfields
的故事板中的新参考出口),我会在textfields
中得到numbers only
输入,但done
按钮不起作用(当我在 iPhone 上按下它时没有任何反应)。如果我不使用delegate
我会得到all characters
输入,但done
工作正常(当我按下它时,iPhone键盘会隐藏)。
有什么建议我可能在这里做错了什么吗?
实现 UITextFieldDelegate 方法:
// This is how we get rid of the keyboard.
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
//Do whatever you need to to save etc...
[textField resignFirstResponder];
return NO;
}
这会告诉键盘在按下完成按钮时隐藏。请务必将视图控制器设置为文本字段的委托: myTextField.delegate = self;(可能在视图中DidLoad)