我知道这已经回答了，但我真的不喜欢使用字符串字面量的换行，所以这是我所做的。

- (BOOL)textView:(UITextView *)txtView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
    if( [text rangeOfCharacterFromSet:[NSCharacterSet newlineCharacterSet]].location == NSNotFound ) {
        return YES;
    }

    [txtView resignFirstResponder];
    return NO;
}

Swift 4.0更新:

func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
if (text as NSString).rangeOfCharacter(from: CharacterSet.newlines).location == NSNotFound {
    return true
}
txtView.resignFirstResponder()
return false
}

UITextView没有任何在用户点击返回键时被调用的方法。如果您希望用户只能添加一行文本，请使用UITextField。按回车键并隐藏UITextView的键盘不符合接口准则。

即使这样，如果你想这样做，实现textView:shouldChangeTextInRange:replacementText:方法的UITextViewDelegate，并在检查替换文本是否\n，隐藏键盘。

也许还有别的办法，但我不知道有什么办法。

对于Xcode 6.4。Swift 1.2。：

   override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent)
    {
        super.touchesBegan(touches, withEvent: event)
        if let touch = touches.first as? UITouch
        {
            self.meaningTextview.resignFirstResponder()
        }
    }

我的诀窍是:

1-创建一个按钮覆盖整个视图; 2-将它发送到视图的后台， 3-在属性检查器中将它的类型从“圆角矩形”改为“自定义” 4-创建一个动作 5-实施动作方法:

- (IBAction)bgTouched:(id)sender 
{
    //to dismiss keyboard on bg btn pressed
    [_userInput resignFirstResponder];
}

哪里_userInput是你的TextField出口

你应该添加UIToolbar到顶部UITextView，而不是使用shouldChangeTextIn

在Swift 4中

let toolbar = UIToolbar(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 50))
        toolbar.barStyle = .default
        toolbar.items = [
            UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil),
            UIBarButtonItem(title: "Done", style: .done, target: self, action: #selector(doneAction))
        ]
        textView.inputAccessoryView = toolbar

@objc func doneAction(){
 self.textView.resignFirstResponder()
}

//你可以使用这个…

步骤1。第一步是确保声明了对UITextViewDelegate协议的支持。这是在你的头文件中完成的，例如这里的头文件叫做

EditorController。h:

@interface EditorController : UIViewController  {
  UITextView *messageTextView;
}

@property (nonatomic, retain) UITextView *messageTextView;

@end

步骤2。接下来你需要将控制器注册为UITextView的委托。从上面的例子继续，这里是我如何用EditorController作为委托初始化UITextView…

- (id) init {
    if (self = [super init]) {
        // define the area and location for the UITextView
        CGRect tfFrame = CGRectMake(10, 10, 300, 100);
        messageTextView = [[UITextView alloc] initWithFrame:tfFrame];
        // make sure that it is editable
        messageTextView.editable = YES;

        // add the controller as the delegate
        messageTextView.delegate = self;
    }

步骤3。现在拼图的最后一块是采取行动响应shouldCahngeTextInRange消息如下:

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range 
  replacementText:(NSString *)text
{
    // Any new character added is passed in as the "text" parameter
    if ([text isEqualToString:@"\n"]) {
        // Be sure to test for equality using the "isEqualToString" message
        [textView resignFirstResponder];

        // Return FALSE so that the final '\n' character doesn't get added
        return FALSE;
    }
    // For any other character return TRUE so that the text gets added to the view
    return TRUE;
}