-[NSResponder swipeWithEvent：]未调用 [英] -[NSResponder swipeWithEvent:] not called
问题描述
我正在编写一个针对OS X Lion和Snow Leopard的应用程序。我认为我想对滑动事件做出回应。我的理解是，如果在我的自定义视图中实现了该方法，则三指滑动会调用-[NSResponder swipeWithEvent：] 。我已经查看过这个问题和相应的答案，并尝试了以下修改奥斯卡·德尔·本的代码的存根实现：
I am writing an application targeting OS X Lion and Snow Leopard. I have a view that I want to have respond to swipe events. My understanding is that three-finger swipes will call -[NSResponder swipeWithEvent:] if that method is implemented in my custom view. I have already looked at this question and corresponding answers, and tried the following modified stub implementation of Oscar Del Ben's code:
@implementation TestView
- (id)initWithFrame:(NSRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code here.
}
return self;
}
- (void)drawRect:(NSRect)dirtyRect
{
[[NSColor redColor] set];
NSRectFillUsingOperation(dirtyRect, NSCompositeSourceOver);
}
- (void)swipeWithEvent:(NSEvent *)event {
NSLog(@"Swipe event detected!");
}
- (void)beginGestureWithEvent:(NSEvent *)event {
NSLog(@"Gesture detected!");
}
- (void)endGestureWithEvent:(NSEvent *)event {
NSLog(@"Gesture end detected!");
}
- (void)mouseDown:(NSEvent *)theEvent {
NSLog(@"mouseDown event detected!");
}
@end
这可以编译并正常运行，并且该视图将按预期方式呈现。 mouseDown：事件已正确注册。但是，没有其他事件被触发。 begin / endGestureWithEvent：方法和 swipeWithEvent：方法都没有。这让我感到奇怪：是否需要在某个地方设置项目/应用程序设置才能正确接收和/或解释手势？在此先感谢您的帮助。
This compiles and runs fine, and the view renders as expected. The mouseDown: event is properly registered. However, none of the other events are triggered. Neither the begin/endGestureWithEvent: methods, nor the swipeWithEvent: method. Which makes me wonder: do I need to set a project/application setting somewhere to properly receive and/or interpret gestures? Thanks in advance for the help.
推荐答案
要接收 swipeWithEvent：消息，您必须确保三指滑动手势未映射到任何可能引起冲突的内容。转到系统偏好设置->触控板->更多手势，并将这些偏好设置设置为以下选项之一：
To receive swipeWithEvent: messages, you have to ensure that the 3 finger swipe gesture is not mapped to anything that might cause a conflict. Go to System preferences -> Trackpad -> More Gestures, and set these preferences to one of the following:
-
在页面之间滑动：
Swipe between pages:
- 用两三个手指滑动，或
- 用三个手指滑动
-
在全屏应用程序之间滑动：
Swipe between full-screen apps:
- 用四根手指向左或向右滑动
特别是，全屏应用之间的滑动不应设置为三个手指，否则您将不会获得 swipeWithEvent：消息。
Specifically, the swipe between full-screen apps should not be set to three fingers, otherwise you will not get swipeWithEvent: messages.
这两个首选项设置一起将 swipeWithEvent：消息发送给第一响应者。
Together, these two preference settings cause swipeWithEvent: messages to be sent to the first responder.
当然，您仍然必须实现实际的滑动逻辑。而且，如果您想在iOS上执行流畅的滚动滑动，则需要做更多的工作。 Lion App Kit发行说明中的流体刷卡跟踪部分提供了一个示例。
Of course, you still have to implement the actual swipe logic. And if you want to perform a fluid scroll-swipe à la iOS, then you will need to do a little more work. There is an example of how to do this in the Lion App Kit release notes under the section "Fluid Swipe Tracking."
请参见http://developer.apple.com/library/mac/#releasenotes/Cocoa/AppKit.html
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