Question

我想使用自定义NSColor背景（[NSColor colorWithPatternImage:[NSImage imageNamed:@"pattern.png"]]）设置自定义视图（不是主视图）。我已经尝试制作自定义视图类：

·H

#import <AppKit/AppKit.h>

@interface CustomBackground : NSView {
    NSColor *background; 
}
@property(retain) NSColor *background;
@end

的.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

然后在AppDelegate中：

[self.homeView changeColor:[NSColor colorWithPatternImage:[NSImage imageNamed:@"pattern.png"]]];

但没有任何反应，颜色保持不变。怎么了？或者有更简单的方法吗？ NSView没有backgroundColor属性：（

Answer 1

尝试

[self.homeView setWantsLayer:YES];
self.homeView.layer.backgroundColor = [NSColor redColor].CGColor;

Answer 2

最好使用从setBackground:属性获取的已制作的background方法。因此，请将您的changeColor:方法替换为：

-(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];
}

要更改视图的颜色，您只需执行以下操作：

self.homeView.background = [NSColor colorWithPatternImage:[NSImage imageNamed:@"pattern.png"]]

设置NSView的背景颜色

2 个答案: