Question

Hi I have draw a gradient in core graphic using drawRect function..

but I don't know how to draw a border to surround this view?

this is my code, could anyone help?

- (void)drawRect:(CGRect)rect {

    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    CGContextRef context = UIGraphicsGetCurrentContext();

    NSArray *gradientColors = [NSArray arrayWithObjects:(id)[UIColor blackColor].CGColor, [UIColor colorWithRed:90/255.0 green:0 blue:0 alpha:1].CGColor, nil];

    CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, (__bridge CFArrayRef) gradientColors, NULL);

    CGPoint startPoint = CGPointMake(CGRectGetMidX(rect), CGRectGetMinY(rect));
    CGPoint endPoint = CGPointMake(CGRectGetMidX(rect), CGRectGetMaxY(rect));

    CGContextDrawLinearGradient(context, gradient, startPoint, endPoint, 0);
    CGGradientRelease(gradient);
    CGColorSpaceRelease(colorSpace);

}

Answer 1

如果您只想在视图周围绘制边框，请尝试以下操作：

UIBezierPath *border = [UIBezierPath bezierPathWithRect:rect];
[[UIColor redColor] setStroke];
[border setLineWidth:4.0];
[border stroke];

在drawRect：方法结束时使用它。

iOS drawRect draw a border

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