Question

第6行和第7行有错误编译。它说“预期标识符或（”。有人可以帮我这个吗？

#import <UIKit/UIKit.h>

@interface BIDViewController : UIViewController
@property (weak, nonatomic) IBOutlet UITextField *numberField;
@property (weak, nonatomic) IBOutlet UITextField *nameField;
- (IBAction)textFieldDoneEditing:(id)sender;
[self.nameField resignFirstResponder];
[self.numberField resignFirstResponder];
@end

Answer 1

您对resignFirstResponder的来电不属于@interface。应该通过@implementation中的相关方法（例如来自textFieldShouldReturn，来自屏幕上其他地方的UITapGestureRecognizer或touchesBegan或任何地方）来调用它们。

Answer 2

BIDViewController.h：

#import <UIKit/UIKit.h>

@interface BIDViewController : UIViewController
@property (weak, nonatomic) IBOutlet UITextField *numberField;
@property (weak, nonatomic) IBOutlet UITextField *nameField;
- (IBAction)textFieldDoneEditing:(id)sender;
@end

BIDViewController.m：

#include "BIDViewController.h";

@implementation BIDViewController

- (IBAction)textFieldDoneEditing:(id)sender
{
    [self.nameField resignFirstResponder];
    [self.numberField resignFirstResponder];
}

@end

Answer 3

您无法在头文件中触发方法。它们需要位于实现文件中的方法内。标题（.h）文件用于向编译器等声明内容，实现文件（.m）是应该发生魔法的地方。

做这样的事情

您的头文件..

#import <UIKit/UIKit.h>

@interface BIDViewController : UIViewController
@property (weak, nonatomic) IBOutlet UITextField *numberField;
@property (weak, nonatomic) IBOutlet UITextField *nameField;
- (IBAction)textFieldDoneEditing:(id)sender;

@end

您的实施文件（.m）

#import "BIDViewController.h"

@implementation BIDViewController

- (IBAction)someMethodOrAction:(id)sender {

[self.nameField resignFirstResponder];
[self.numberField resignFirstResponder];
}

@end

iPhone应用程序无法编译

3 个答案: