Setting the background color of an NSView
I want to set a cu开发者_运维问答stom view (not the main one) with a custom NSColor background ([NSColor colorWithPatternImage:[NSImage imageNamed:@"pattern.png"]]
). I've tried making a custom view class:
.h
#import <AppKit/AppKit.h>
@interface CustomBackground : NSView {
NSColor *background;
}
@property(retain) NSColor *background;
@end
.m
#import "CustomBackground.h"
@implementation CustomBackground
@synthesize background;
- (void)drawRect:(NSRect)rect
{
[background set];
NSRectFill([self bounds]);
}
- (void)changeColor:(NSColor*) aColor
{
background = aColor;
[aColor retain];
}
@end
And then in the AppDelegate:
[self.homeView changeColor:[NSColor colorWithPatternImage:[NSImage imageNamed:@"pattern.png"]]];
But nothing happens, the color remains the same. What's wrong? Or is there an easier way? NSView doesn't have a backgroundColor
property :(
Try
[self.homeView setWantsLayer:YES];
self.homeView.layer.backgroundColor = [NSColor redColor].CGColor;
It's best to use the already-made setBackground:
method that you get from the background
property. So replace your changeColor:
method with:
-(void)setBackground:(NSColor *)aColor
{
if([background isEqual:aColor]) return;
[background release];
background = [aColor retain];
//This is the most crucial thing you're missing: make the view redraw itself
[self setNeedsDisplay:YES];
}
To change the color of your view, you can simply do:
self.homeView.background = [NSColor colorWithPatternImage:[NSImage imageNamed:@"pattern.png"]]
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