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[iOS] NXDrawKit：非常讨巧、实用的小画板

Purpose

It's just started for my personal app for iPhone. Though, it can not be customized as much as you want, you can use Smooth Freehand Drawing View easily. I made Palette and ToolBar for using Canvas , so you don't have to use Palette and ToolBar .

NXDrawKitis a set of classes designed to use drawable view easily. This framework consists of 3 kinds of views.

Canvas providing redo, undo, clear, save and load image is a view for drawing.
Palette calls delegate with color, alpha and width when user clicks the button.
ToolBar represents the features of Canvas , and can show the status of Canvas .

Screenshot

[iOS] NXDrawKit：非常讨巧、实用的小画板

Installation

Using CocoaPods:

pod 'NXDrawKit'

Using Carthage:

github "nicejinux/NXDrawKit"

Components

Canvas

- Delegate

Canvas will call the delegate when user draw or save image.

Delegate provides user stroke image, background image and merged image.
User should provide the Brush to Canvas for drawing.

// optional
func canvas(canvas: Canvas, didUpdateDrawing drawing: Drawing, mergedImage image: UIImage?)
func canvas(canvas: Canvas, didSaveDrawing drawing: Drawing, mergedImage image: UIImage?)

// required
func currentBrush() -> Brush?

- Model

public class Drawing: NSObject {
    public var stroke: UIImage?
    public var background: UIImage?

    public init(stroke: UIImage? = nil, background: UIImage? = nil) {
        self.stroke = stroke
        self.background = background
    }
}

public class Brush: NSObject {
    public var color: UIColor = UIColor.blackColor()
    public var width: CGFloat = 5.0
    public var alpha: CGFloat = 1.0
}

- Public Methods

User can set background image.
User can undo , redo or clear the Canvas . ( Maximum history size is 50 )
User can save current stroke and background internally, then Canvas calls didSavePaper: delegate

func update(backgroundImage: UIImage?)
func undo()
func redo()
func clear()
func save()

Palette

Palette has 12 buttons for color, 3 buttons for alpha and 4 buttons for width of brush.
You can customize color, value of alpha and width of brush with delegate,
You can't customize number of buttons.

- Delegate

Palette will call the delegate when user clicks the color, alpha or width button.
You can customize the color, alpha or width with delegate. ( all delegates are optional )

func didChangeBrushColor(color: UIColor)
func didChangeBrushAlpha(alpha: CGFloat)
func didChangeBrushWidth(width: CGFloat)

tag can be 1 ... 12
If you return nil , the color of tag will set with default color provided by NXDrawKit .

func colorWithTag(tag: NSInteger) -> UIColor?

tag can be 1 ... 3
If you return -1 , the alpha of tag will set with default alpha provided by NXDrawKit .

func alphaWithTag(tag: NSInteger) -> CGFloat

tag can be 1 ... 4
If you return -1 , the width of tag will set with default width provided by NXDrawKit .

func widthWithTag(tag: NSInteger) -> CGFloat

- Public Method

func currentBrush() -> Brush

ToolBar

- Public Properties

All buttons are set with default values without #selector .
If you want to use buttons on the ToolBar , you have to add #selector for each buttons.

var undoButton: UIButton?
var redoButton: UIButton?
var saveButton: UIButton?
var loadButton: UIButton?
var clearButton: UIButton?

Will be improved

There is no Eraser, so user can't erase stroke.
User can't remove background image after it's set.
Palette and ToolBar can't customize easily.
All the codes looks like ObjC .

Author

This is Jinwook Jeon . I've been working as an iOS developer in Korea. This is my first Swift project, so there can be lots of weird things in this framework. I'm waiting for your comments, suggestions, fixes, everything what you want to say. Feel free to contact me.

email : nicejinux@gmail.com
facebook : http://facebook.com/Nicejinux
homepage : http://Nicejinux.NET

MIT License

Copyright (c) 2016 Jinwook Jeon. All rights reserved.

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

原文 https://github.com/Nicejinux/NXDrawKit

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