[iOS] graphics tutorial - draw any shap as you want

• 1 The iOS Drawing Example Application
• 2 Creating the New Project
• 3 Creating the UIView Subclass
• 4 Locating the drawRect Method in the UIView Subclass
• 5 Drawing a Line
• 6 Drawing Paths
• 7 Drawing a Rectangle
• 8 Drawing an Ellipse or Circle
• 9 Filling a Path with a Color
• 10 Drawing an Arc
• 11 Drawing a Cubic Bézier Curve
• 12 Drawing a Quadratic Bézier Curve
• 13 Dashed Line Drawing
• 14 Drawing Shadows
• 15 Drawing Gradients
• 16 Drawing an Image into a Graphics Context
• 17 Image Filtering with the Core Image Framework