Question

当我按下iOS中的返回键时，我无法让键盘消失。我在我的头文件中，我设置self.textField.delegate = self;我实施了以下内容：

-(BOOL)textFieldShouldReturn:UITextField *)textField {
[textField resignFirstResponder];
}

首先，当我按下Enter键时它不会做任何事情，但现在，在使用Connections Inspector将Exit End on Exit连接到View Controller后，我得到一个NSInvalidArgumentException原因 - [ViewController dismissKeyboard：]：无法识别的选择器发送到实例0x155e10620。

有什么想法吗？我正在使用Xcode 6.1。我将Did End On Exit连接到textField所在的View Controller，当我发布连接时，出现一个小按钮，上面写着originText，我选择了它，因为它是唯一的选项。

这是我的代码（缩写） -

#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#import <CoreBluetooth/CoreBluetooth.h>


@interface ViewController : UIViewController <CBCentralManagerDelegate, CBPeripheralDelegate, UITextFieldDelegate>

@property (strong, nonatomic) CBCentralManager *centralManager;

@property (strong, nonatomic) CBPeripheral *discoveredPerepheral;
@property (strong) CBUUID *myServiceUUID;
@property (strong, nonatomic) NSMutableData *data;

@property (strong, nonatomic) IBOutlet UITextField *originText;
@property (strong, nonatomic) IBOutlet UITextField *destText;
@property (strong, nonatomic) AVSpeechSynthesizer *synth;
@property (strong, nonatomic) AVSpeechUtterance *utter;
@property (weak, nonatomic) IBOutlet UILabel *charLabel;

@property (weak, nonatomic) IBOutlet UILabel *isConnected;

@property (weak, nonatomic) IBOutlet UILabel *myPeripherals;

@property (weak, nonatomic) IBOutlet UILabel *aLabel;
- (IBAction)originText:(id)sender;

- (BOOL)textFieldShouldReturn:(UITextField *)textField;
- (void)textFieldDidEndEditing:(UITextField *)textField;


@end



#import "ViewController.h"

@interface ViewController ()

@property int myInt;

@end

@implementation ViewController

bool isConnected = NO;
CBCharacteristic *originChar;
CBUUID *originUUID;
NSString *const tempUUID = @"0499F5DB-DDC6-4BEF-B551-EB69F9254BB9";

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle     *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
    // Custom initialization
}
return self;
}

- (void)viewDidLoad {

self.centralManager = [[CBCentralManager alloc]initWithDelegate:self     queue:nil options:nil];
_data = [[NSMutableData alloc]init];
originUUID = [CBUUID UUIDWithString:@"0499F5DB-DDC6-4BEF-B551-EB69F9254BB9"];
_myServiceUUID = [CBUUID UUIDWithString:@"16055ED2-606D-47D4-B4C0-8F6BFC903DAB"];
_synth = [[AVSpeechSynthesizer alloc] init];
[_originText setDelegate:self];
[_destText setDelegate:self];
_originText.returnKeyType = UIReturnKeyGo;

} ...

- (IBAction)originText:(id)sender {
    if (isConnected) {
        NSData *dataToWrite = [_originText.text dataUsingEncoding:NSUTF8StringEncoding];
        //[_discoveredPerepheral writeValue:dataToWrite forCharacteristic:originChar type:CBCharacteristicWriteWithResponse];
        NSLog(@"Data Written.");
    }
    NSLog(@"Disconnected.");
}


- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    NSLog(@"HEy Hey");
    [textField resignFirstResponder];
    return NO;
}

- (void)textFieldDidEndEditing:(UITextField *)textField {
    [textField resignFirstResponder];
}

@end

Answer 1

textFieldSouldReturn中有拼写错误。因此，从未调用此委托方法。

Answer 2

  -(BOOL)textFieldShouldReturn:UITextField *)textField {
[textField resignFirstResponder];
return NO;
}

Answer 3

尝试：

[self.view endEditing:YES];

有时候效果会更好，因为哪个控件目前是第一响应者并不重要。

Answer 4

您应该在.h文件中声明UITextFieldDelegate，然后在.m文件中声明，使用self.textField.delegate = self。

Answer 5

从.h文件中删除textField的声明，它们可能会混淆编译器并覆盖委托方法。此外，摆脱退出连接上的Did End，因为管理键盘是不必要的。

在iOS中摆脱键盘

5 个答案: