如何在Objective-C中隐藏FSCalendar的月份占位符？

Hey there! I’ve tackled this exact issue with FSCalendar before, so let me share a couple of reliable ways to get rid of those month placeholders:

1. Use the Calendar Delegate Method to Filter Dates #

The most straightforward approach is to implement the calendar:shouldDisplayDate: delegate method. This lets you control which dates are rendered on the calendar. Just return NO for any date that isn’t part of the current month:

// Objective-C
- (BOOL)calendar:(FSCalendar *)calendar shouldDisplayDate:(NSDate *)date {
    NSDateComponents *components = [calendar.calendar components:NSCalendarUnitMonth | NSCalendarUnitYear fromDate:date];
    NSDateComponents *currentComponents = [calendar.calendar components:NSCalendarUnitMonth | NSCalendarUnitYear fromDate:calendar.currentPage];
    return (components.month == currentComponents.month && components.year == currentComponents.year);
}

// Swift
func calendar(_ calendar: FSCalendar, shouldDisplay date: Date) -> Bool {
    let components = calendar.calendar.dateComponents([.month, .year], from: date)
    let currentComponents = calendar.calendar.dateComponents([.month, .year], from: calendar.currentPage)
    return components.month == currentComponents.month && components.year == currentComponents.year
}

This will prevent any dates outside the currently displayed month from showing up entirely.

2. Customize the Appearance of Placeholder Dates #

If you don’t want to remove them from the layout but just make them invisible, you can tweak the calendar’s appearance properties to make placeholder dates blend into the background:

// Objective-C
calendar.appearance.placeholderColor = [UIColor clearColor];
calendar.appearance.placeholderBackgroundColor = [UIColor clearColor];

// Swift
calendar.appearance.placeholderColor = .clear
calendar.appearance.placeholderBackgroundColor = .clear

3. Target the Placeholder View Directly (Advanced) #

If the above methods don’t fit your use case, you can directly access and hide the internal FSCalendarMonthPlaceholderView instances by traversing the calendar’s subviews:

// Objective-C
- (void)hidePlaceholderViews {
    for (UIView *subview in calendar.subviews) {
        if ([subview isKindOfClass:NSClassFromString(@"FSCalendarMonthPlaceholderView")]) {
            subview.hidden = YES;
        }
    }
}

// Swift
func hidePlaceholderViews() {
    for subview in calendar.subviews {
        if subview.className == "FSCalendarMonthPlaceholderView" {
            subview.isHidden = true
        }
    }
}

Call this method after the calendar has finished loading (like in viewDidAppear: or after reloading the calendar). Note that this relies on internal class names, which might change in future FSCalendar updates, so use it with caution.

内容的提问来源于stack exchange，提问作者Videh Jaiswal