模拟器截图

加边框和圆角

UIBezierPath *maskPath;
CGRect boardRect;

float h = cell.bounds.size.height;
float w = cell.bounds.size.width;

if (indexPath.row == 0) {
    boardRect = cell.bounds;
    maskPath = [[UIBezierPath bezierPathWithRoundedRect:cell.bounds byRoundingCorners:UIRectCornerTopLeft cornerRadii:CGSizeMake(10, 10)] bezierPathByReversingPath];
} else if (indexPath.row == 3) {
    boardRect = CGRectMake(-1, 0, w+1, h);
    maskPath = [[UIBezierPath bezierPathWithRoundedRect:cell.bounds byRoundingCorners:UIRectCornerTopRight cornerRadii:CGSizeMake(10, 10)] bezierPathByReversingPath];
} else if (indexPath.row == 4) {
    boardRect = CGRectMake(0, -1, w, h+1);
    maskPath = [[UIBezierPath bezierPathWithRoundedRect:cell.bounds byRoundingCorners:UIRectCornerBottomLeft cornerRadii:CGSizeMake(10, 10)] bezierPathByReversingPath];
} else {
    boardRect = CGRectMake(-1, 0, w+2, h);
    maskPath = [UIBezierPath bezierPathWithRect:boardRect];
}

for (CALayer *layer in cell.contentView.layer.sublayers) {
    if ([layer.name isEqualToString:@"maskLayer"]) {
        [layer removeFromSuperlayer];
    }
}

CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];

maskLayer.name = @"maskLayer";
maskLayer.frame = boardRect;
maskLayer.path = maskPath.CGPath;
maskLayer.strokeColor = JXColorSeparatorDark.CGColor;
maskLayer.lineDashPattern = @[@4, @2];
maskLayer.lineWidth = 1.0f;
maskLayer.fillColor = [UIColor clearColor].CGColor;
maskLayer.masksToBounds = YES;

[cell.contentView.layer insertSublayer:maskLayer atIndex:0];

设置选中效果

在collectionViewCell.m中

- (void)setSelected:(BOOL)selected {
    [super setSelected:selected];
    
    UIColor *fillColor = selected == YES ? JXColorBack : [UIColor clearColor];

    
    for (CALayer *layer in self.contentView.layer.sublayers) {
        if ([layer.name isEqualToString:@"maskLayer"]) {
            
            CAShapeLayer *shape = (CAShapeLayer *)layer;
            
            shape.fillColor = fillColor.CGColor;
        }
    }
}