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// 添加三角形，并添加渐变效果
CGContextRef triangleContext = UIGraphicsGetCurrentContext();
UIBezierPath *trianglePath = [[UIBezierPath alloc] init];
[trianglePath moveToPoint:CGPointMake(center.x + bounds.size.width / 3, center.y + bounds.size.height / 3)];
[trianglePath addLineToPoint:CGPointMake(center.x - bounds.size.width / 3, center.y + bounds.size.height / 3)];
[trianglePath addLineToPoint:CGPointMake(center.x, center.y - bounds.size.height / 3)];
[trianglePath addLineToPoint:CGPointMake(center.x + bounds.size.width / 3, center.y + bounds.size.height / 3)];
[trianglePath stroke];
CGContextSaveGState(triangleContext);
[trianglePath addClip];
CGFloat locations[2] = { 0.0, 1.0 };
CGFloat components[8] = { 1.0, 1.0, 0.0, 1.0,
0.0, 0.5, 0.0, 1.0 };
CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB();
CGGradientRef gradient = CGGradientCreateWithColorComponents(colorspace, components, locations, 2);
CGPoint startPoint = CGPointMake(center.x, center.y + bounds.size.height / 3 );
CGPoint endPoint = CGPointMake(center.x, center.y - bounds.size.height / 3 );
CGContextDrawLinearGradient(triangleContext, gradient, startPoint, endPoint, 0);
CGGradientRelease(gradient);
CGColorSpaceRelease(colorspace);
CGContextRestoreGState(triangleContext);
// 添加阴影
CGContextRef logoContext = UIGraphicsGetCurrentContext();
CGContextSaveGState(logoContext);
CGContextSetShadow(logoContext, CGSizeMake(4, 7), 3);
// 添加logo，中心点为屏幕中心点
CGRect logoFrame = CGRectMake(center.x - bounds.size.width / 4, center.y - bounds.size.height / 4, bounds.size.width / 4 * 2, bounds.size.height / 4 * 2);
UIImage *logoimage = [UIImage imageNamed:@"logo.png"];
[logoimage drawInRect:logoFrame];
UIView *logoView = [[UIView alloc]initWithFrame:logoFrame];
[self.window addSubview:logoView];
CGContextRestoreGState(logoContext);
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