我创建了 NSSegmentedCell 的子类并实现了drawWithFrame,如下所示:
#import "CustomSegmentedCell.h"
@implementation CustomSegmentedCell
- (void)drawWithFrame:(NSRect)cellFrame inView:(NSView *)controlView {
int i=0, count=[self segmentCount];
NSRect segmentFrame=cellFrame;
for(i=0; i<count; i++) {
segmentFrame.size.width=[self widthForSegment:i];
[NSGraphicsContext saveGraphicsState];
// Make sure that segment drawing is not allowed to spill out into other segments
NSBezierPath* clipPath = [NSBezierPath bezierPathWithRect: segmentFrame];
[clipPath addClip];
[self drawSegment:i inFrame:segmentFrame withView:controlView];
[NSGraphicsContext restoreGraphicsState];
segmentFrame.origin.x+=segmentFrame.size.width;
}
_lastDrawRect=cellFrame;
}
@end
问题是分段在第一次启动应用程序时没有绘制,只有当我用鼠标单击分段控件应该绘制的空白区域时,它才可见。请告诉我,我在这里缺少什么。
谢谢
最佳答案
子类化并实现drawSegment:inFrame:withView:
- (void)drawSegment:(NSInteger)segment inFrame:(NSRect)frame withView:(NSView *)controlView
{
NSBezierPath *path = [NSBezierPath bezierPathWithRoundedRect:frame xRadius:8 yRadius:8];
[path setClip];
[path setLineWidth:2.5];
[[NSColor grayColor] setStroke];
NSColor* bgColr;
if (segment%2) {
bgColr = [NSColor blackColor];
}
else {
bgColr = [NSColor redColor];
}
[bgColr setFill];
[NSBezierPath fillRect:frame];
}
关于cocoa - NSSegmentedCell 子类绘图,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/12000720/