NSScreencast Episode #32 Core Graphics: Gradients

Core Graphics: Gradients - NSScreencast

gradientのeffectを描画

• Core Graphics
  • pure c library
• drawRect
  • helper class
  • CGContextRef context = UIGraphicsGetCurrentContext();
  • drawLinearGradient
    • CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    • CGRectGetMidX
  • drawGlossyGradient
• __bridge cast
  • CFRelease
  • __bridge_transfer
  • ARC
• CGContext
  • CGContextSaveGState
  • CGContextRestoreGState
  • CGContextAddRect
  • CGContextClip
  • stroke
    • CGContextSetStrokeColorWithColor
    • CGContextSetLineWidth
    • CGContextStrokeRect

bridge cast, CGContextとかある