NSTextView放在NSScrollView上,當(dāng)鼠標(biāo)懸停在NSTextView上滾動(dòng)鼠標(biāo)滾輪時(shí)會(huì)發(fā)現(xiàn)NSScrollView并不會(huì)滾動(dòng),事件被NSTextView所攔截,只要重寫scrollWheel方法就可以
1.自定義一個(gè)scrollview
2.重寫scrollWheel方法

- (void)scrollWheel:(NSEvent *)event {
    if ([self.subviews[0].subviews[2] isKindOfClass:[NSTextView class]]) {
        NSTextView *tempView = self.subviews[0].subviews[2];
        if (tempView.string.length == 0) {
            [[self nextResponder] scrollWheel:event];
        }
    }else if (self.verticalScroller.floatValue == 1){
        if (event.deltaY < 0) {
            [[self nextResponder] scrollWheel:event];
        }else{
            [super scrollWheel:event];
        }
    }
    if (self.verticalScroller.floatValue == 0) {
        if (event.deltaY > 0) {
            [[self nextResponder] scrollWheel:event];
        }else{
            [super scrollWheel:event];
        }
    }
    
    [super scrollWheel:event];
}