IOS CGPath improves shadow Performance

It is found that when an application Slide left or right on the page of itouc4or pushes a View Controller, It is very stuck. At last, it was discovered that the border of the navigation controller was added with a shadow.

Previous Code:

-(Void) addFrameLeftLine {

UIColor * color = [UIColor blackColor];

CGSize offset = CGSizeMake (0, 3 );

Float radius = 2;

Float opacity = 1;

Self. navigationController. view. layer. shadowColor = color. CGColor;

Self. navigationController. view. layer. shadowOffset = offset;

Self. navigationController. view. layer. shadowRadius = radius;

Self. navigationController. view. layer. shadowOpacity = opacity;

}

Modified code:

-(Void) addFrameLeftLine {

CGPathRef shadow = CGPathCreateWithRect (CGRectInset (self. navigationController. view. bounds,-5, 0), NULL );

[Self. navigationController. view. layer setShadowPath: shadow];

[Self. navigationController. view. layer setShadowColor: [[UIColor blackColor] CGColor];

[Self. navigationController. view. layer setShadowOpacity: 0.3];

[Self. navigationController. view. layer setShadowRadius: 2];

CFRelease (shadow );

}