问题
How can NSSlider be customised to provide a non-linear scale in cocoa? i.e - 0, 2, 4, 6, 10.
With the slider constrained to stopping on tick marks only, I want the slider to stop on 0, 2, 4, 6, 10 (and not 8 for instance). Thanks.
回答1:
Quickly written example based on an array with the desired values:
SampleAppDelegate.h
#import <Cocoa/Cocoa.h>
@interface SampleAppDelegate : NSObject <NSApplicationDelegate> {
NSWindow * window;
NSArray * values;
IBOutlet NSSlider * theSlider;
IBOutlet NSTextField * theLabel;
}
- (IBAction)sliderChanged:(id)sender;
@property (assign) IBOutlet NSWindow *window;
@end
SampleAppDelegate.h
#import "SampleAppDelegate.h"
@implementation SampleAppDelegate
@synthesize window;
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
values = [[NSArray alloc] initWithObjects:@"0",@"1",@"2",@"10",@"50",nil];
[theSlider setNumberOfTickMarks:[values count]];
[theSlider setMinValue:0];
[theSlider setMaxValue:[values count]-1];
[theSlider setAllowsTickMarkValuesOnly:YES];
[theLabel setStringValue:[values objectAtIndex:0]];
[theSlider setIntValue:0];
}
- (IBAction)sliderChanged:(id)sender {
int current = lroundf([theSlider floatValue]);
[theLabel setStringValue:[values objectAtIndex:current]];
}
@end
Interface Builder:
- Add NSSlider (connect IBOutlet / connect IBAction / enable continuos updating)
- Add NSTextField (connect IBOutlet)
Result:
来源:https://stackoverflow.com/questions/5810753/how-can-nsslider-be-customised-to-provide-a-non-linear-scale-in-cocoa