最近在捣鼓mac上开发app，本以为iOS、mac开发本是同根生，弄起来应该差不多，上手之后才发现iOS是多么的优雅自在，而mac是干啥都觉得不太顺手，UIKit跟AppKit差别还真是不一般的大。
最近，感觉NSScrollView右侧的滑动条长得不好看，想把滑动条的背景去掉，本想着设置个某个属性就能轻而易举的搞定，谁不知捣鼓半天没弄出来，mac开发的相关资料也着实太少，在这里记一笔，加深一下印象。
Tips：需要的同学，可以直接前往这里指点批评，或者为我转身点亮一颗小星星。
滑动条需要瞒住一下几个方面的需求：
- 滑动页面时候，显现滑动条，跟随滑动；
- 停止滑动页面的时候，自动隐藏滑动条；
- 任何时候滑动条背景色为透明；
喜欢我的可以关注收藏我的个人博客：RobberJJ
下面直接上一下，NSScroller子类 JJScroller的.m文件
@implementation JJScroller
- (id)initWithFrame:(NSRect)frameRect
{
self = [super initWithFrame:frameRect];
if (self == nil) {
return nil;
}
[self commonInitializer];
return self;
}
- (void)awakeFromNib
{
[super awakeFromNib];
[self commonInitializer];
}
- (void)commonInitializer
{
NSTrackingArea *trackingArea = [[NSTrackingArea alloc] initWithRect:self.bounds options:(
NSTrackingMouseEnteredAndExited | NSTrackingActiveInActiveApp | NSTrackingMouseMoved
) owner:self userInfo:nil];
[self addTrackingArea:trackingArea];
}
- (void)drawRect:(NSRect)dirtyRect {
// Do some custom drawing...
// Call NSScroller's drawKnob method (or your own if you overrode it)
[self drawKnob];
}
- (void)drawKnobSlotInRect:(NSRect)slotRect highlight:(BOOL)flag
{
// Don't draw the background. Should only be invoked when using overlay scrollers
}
- (void)mouseExited:(NSEvent *)theEvent
{
[super mouseExited:theEvent];
[self fadeOut];
}
- (void)mouseEntered:(NSEvent *)theEvent
{
[super mouseEntered:theEvent];
[NSAnimationContext runAnimationGroup:^(NSAnimationContext *context) {
context.duration = 0.1f;
[self.animator setAlphaValue:1.0f];
} completionHandler:^{
}];
[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(fadeOut) object:nil];
}
- (void)mouseMoved:(NSEvent *)theEvent
{
[super mouseMoved:theEvent];
self.alphaValue = 1.0f;
}
- (void)setFloatValue:(float)aFloat
{
[super setFloatValue:aFloat];
[self.animator setAlphaValue:1.0f];
[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(fadeOut) object:nil];
[self performSelector:@selector(fadeOut) withObject:nil afterDelay:1.5f];
}
- (void)fadeOut
{
[NSAnimationContext runAnimationGroup:^(NSAnimationContext *context) {
context.duration = 0.3f;
[self.animator setAlphaValue:0.0f];
} completionHandler:^{
}];
}
+(CGFloat)scrollerWidthForControlSize:(NSControlSize)controlSize scrollerStyle:(NSScrollerStyle)scrollerStyle{
return 15;
}
+ (BOOL)isCompatibleWithOverlayScrollers
{
return self == [JJScroller class];
}
@end
