从创建Xcode项目开始，一路到创建app图标，完成了一个可以替代物理棋盘的iOS应用。
Swift Chess 1 | Creating Xcode project and adding a BoardView for chess board
Swift Chess 2 | Drawing the chess board for any screen size
Swift Chess 3 | Adding 12 piece images into Xcode
Swift Chess 4 | Drawing 32 pieces on board
Swift Chess 5 | Detecting finger touches
Swift Chess 6 | Implementing a model function to move a piece
Swift Chess 7 | Moving pieces with a finger
Swift Chess 8 | Dragging a piece with our finger
Swift Chess 9 | Fixing a bug when moving a piece to its original location
Swift Chess 10 | Baking our app icon
