Cocoa 如何在objective-c中的子NSTextView焦点上围绕NSBox绘制焦点环
我在NSBox中有一个NSTextView。每当NSTextView获得焦点时,我想在NSBox周围绘制焦点环,并在NSTextView失去焦点时移除焦点环Cocoa 如何在objective-c中的子NSTextView焦点上围绕NSBox绘制焦点环,cocoa,nstextview,nsbox,focusrect,Cocoa,Nstextview,Nsbox,Focusrect,我在NSBox中有一个NSTextView。每当NSTextView获得焦点时,我想在NSBox周围绘制焦点环,并在NSTextView失去焦点时移除焦点环 谢谢,为此,请创建NSTextView的子类,并重写-becomeFirstResponder,如下所示: - (BOOL)becomeFirstResponder { BOOL returnValue = [super becomeFirstResponder]; if (returnValue) { //
谢谢,为此,请创建NSTextView的子类,并重写-becomeFirstResponder,如下所示:
- (BOOL)becomeFirstResponder
{
BOOL returnValue = [super becomeFirstResponder];
if (returnValue) {
//do something here when this becomes first responder
}
return returnValue;
}
- (BOOL)resignFirstResponder
{
BOOL returnValue = [super resignFirstResponder];
if(returnValue){
//do something when resigns first responder
}
return returnValue;
}
您可以在上面的if语句中设置,以便在运行代码块时,可以调用包含NSBox的视图,然后在NSBox上绘制一个焦点环。要处理NSTextView失去焦点的问题,您需要覆盖-resignFirstResponder,如下所示:
- (BOOL)becomeFirstResponder
{
BOOL returnValue = [super becomeFirstResponder];
if (returnValue) {
//do something here when this becomes first responder
}
return returnValue;
}
- (BOOL)resignFirstResponder
{
BOOL returnValue = [super resignFirstResponder];
if(returnValue){
//do something when resigns first responder
}
return returnValue;
}
确保在interface builder中更改类,并将头文件和/或实现文件中的类类型更改为NSTextView的新子类: