在我的Catalyst应用程序中,我使用Mac Helpers存储库中的代码生成了带有回调的NSColorPanel
。
@interface IPDFMacColorPanel : NSObject
+ (void)showColorPanelWithColorChangeHandler:(void(^)(UIColor *color))colorChangeHandler;
/// Hides the color picker panel and removes the colorChangeHandler observer
+ (void)hide;
+ (void)removeColorChangeHandlerObserver;
@end
@interface NSColorPanel_Catalyst : NSObject
+ (instancetype)sharedColorPanel;
- (void)makeKeyAndOrderFront:(id)sender;
- (void)orderFront:(id)sender;
- (void)orderOut:(id)sender;
- (void)setTarget:(id)target;
- (void)setAction:(SEL)action;
- (UIColor *)color;
@end
@interface IPDFMacColorPanel ()
@property (nonatomic,copy) void(^colorChangeHandler)(UIColor *color);
@end
@implementation IPDFMacColorPanel
+ (instancetype)sharedPanel
{
static IPDFMacColorPanel *panel = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
panel = [IPDFMacColorPanel new];
});
return panel;
}
+ (NSColorPanel_Catalyst *)colorPanel
{
return [NSClassFromString(@"NSColorPanel") performSelector:@selector(sharedColorPanel)];
}
+ (void)showColorPanelWithColorChangeHandler:(void(^)(UIColor *color))colorChangeHandler
{
IPDFMacColorPanel *observer = [IPDFMacColorPanel sharedPanel];
observer.colorChangeHandler = colorChangeHandler;
NSColorPanel_Catalyst *colorPanel = [self colorPanel];
[colorPanel setTarget:observer];
[colorPanel setAction:@selector(colorChange:)];
[colorPanel orderFront:nil];
}
+ (void)hide
{
[[self colorPanel] orderOut:nil];
[self removeColorChangeHandlerObserver];
}
+ (void)removeColorChangeHandlerObserver
{
[IPDFMacColorPanel sharedPanel].colorChangeHandler = nil;
}
- (void)colorChange:(NSColorPanel_Catalyst *)colorPanel
{
if (self.colorChangeHandler) self.colorChangeHandler(colorPanel.color);
}
@end
我像这样生成它:
IPDFMacColorPanel.show { (color) in
if let color = color {
self.saveColor(color)
}
}
然后将其写入Realm:
public func saveColor(_ color: UIColor) {
try! realm.write {
let converted = ColorUtility.convert(color: color)
if let green = converted["green"] {
self.restaurant.green = green
}
if let red = converted["red"] {
self.restaurant.red = red
}
if let blue = converted["blue"] {
self.restaurant.blue = blue
}
if let alpha = converted["alpha"] {
self.restaurant.alpha = alpha
}
}
}
但是,发生的事情是,因为我收到了太多的回调,所以Realm正在编写很多颜色,从而使颜色面板滞后。有什么想法可以解决吗?
在Objective-C方面写文章。
// new property - add after `@interface IPDFMacColorPanel` line
@property (nonatomic,copy) UIColor *pendingNewColor;
- (void)colorChange:(NSColorPanel_Catalyst *)colorPanel
{
if (self.pendingNewColor) {
self.pendingNewColor = colorPanel.color;
} else {
self.pendingNewColor = colorPanel.color;
[self performSelector:@selector(doUpdateColor:) withObject:nil afterDelay:0.4];
}
}
- (void)doUpdateColor:(id)ignore {
UIColor *color = self.pendingNewColor;
self.pendingNewColor = nil;
if (self.colorChangeHandler) self.colorChangeHandler(color);
}
当更改颜色时,如果存在未决颜色,则假定将在0.4秒内发送doUpdateColor:消息,并仅更新未决颜色,否则将设置未决颜色并安排doUpdateColor:消息的发送时间。