CGRect

• A structure that contains the location and dimensions of a rectangle.
• 사각형의 위치와 크기를 포함하는 구조체이다.

Overview

• In the default Core Graphics coordinate space, the origin is located in the lower-left corner of the rectangle and the rectangle extends towards the upper-right corner. If the context has a flipped-coordinate space—often the case on iOS—the origin is in the upper-left corner and the rectangle extends towards the lower-right corner.

  

  CGSize와 다르게 origin을 가진다.

public struct CGRect { 
		public var origin: CGPoint
		public var size: CGSize
		public init()
		public init(origin: CGPoint, size: CGSize)
}

CGPoint

• A structure that contains a point in a two-dimensional coodinate system
• 2차원 좌표계의 점을 포함하는 구조체이다.

(1,2) x : 1, y : 2

public struct CGPoint {
		public var x: CGFloat
		public var y: CGFloat
		public init() 
		public init(x: CGFloat, y: CGFloat)
}

CGSize

• A structure that contains width and height values.
• 너비와 높이 값들을 포함하고 있는 구조체이다.

Overview

A CGSize structure is sometimes used to represent a distance vector, rather than a physical size. As a vector, its values can be negative. To normalize a CGRect structure so that its size is represented by positive values, call the standaradized function.

public struct CGSize {
		public var width: CGFloat
		public var height: CGFloat
		public init()
		public init(width: CGFloat, height: CGFloat)
}