Drawing board, drawing board what brand is good

Drawing board, drawing board what brand is good

Knowledge Point: Save the information on the View to the album.

Drawing Graphics and routes

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# Import <UIKit/UIKit. h>

@ Interface FFFPaintView: UIView

@ Property (nonatomic, strong) UIColor * lineColor;

@ Property (nonatomic, assign) CGFloat lineWithed;

@ Property (nonatomic, copy) CGFloat (^ lineWithBlock )();

// Clear screen

-(Void) clearScreen;

// Rollback

-(Void) recede;

// Eraser

-(Void) eraser;

@ End

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# Import "FFFPaintView. h"

@ Interface FFFBezierPath: UIBezierPath

@ Property (nonatomic, strong) UIColor * lineColor;

@ End

@ Implementation FFFBezierPath

@ End

 

@ Interface FFFPaintView ()

@ Property (nonatomic, strong) NSMutableArray * paths;

@ End

@ Implementation FFFPaintView

 

-(NSMutableArray *) paths {

 

If (_ paths = nil ){

_ Paths = [NSMutableArray array];

}

Return _ paths;

}

// Clear screen

-(Void) clearScreen {

// Note that sometimes an error occurs when you remove all of them here. To prevent this, we recommend that you = nil, and then re-paint them.

[Self. paths removeAllObjects];

Self. paths = nil;

// Redraw

[Self setNeedsDisplay];

}

// Rollback

-(Void) recede {

[Self. paths removeLastObject];

// Redraw

[Self setNeedsDisplay];

}

// Eraser

-(Void) eraser {

Self. lineColor = self. backgroundColor;

// Redraw

[Self setNeedsDisplay];

}

 

-(Void) touchesBegan :( NSSet *) touches withEvent :( UIEvent *) event {

// Obtain the touch object

UITouch * touch = [touches anyObject];

// Obtain the finger position by touching the object

CGPoint point = [touch locationInView: touch. view];

// Create a path object

FFFBezierPath * path = [FFFBezierPath alloc] init];

[Path moveToPoint: point];

// Set the line color

Path. lineColor = self. lineColor;

 

If (self. lineWithBlock ){

Path. lineWidth = self. lineWithBlock ();

}

// The following method cannot obtain the value.

// Path. lineWidth = self. lineWithed;

// NSLog (@ "% f", self. lineWithed );

// Add path to the array

[Self. paths addObject: path];

}

 

-(Void) touchesMoved :( NSSet *) touches withEvent :( UIEvent *) event {

 

// Obtain the touch object

UITouch * touch = [touches anyObject];

CGPoint point = [touch locationInView: touch. view];

// Use the last path in the array to connect

[[Self. paths lastObject] addLineToPoint: point];

// Redraw

[Self setNeedsDisplay];

}

 

-(Void) drawRect :( CGRect) rect {

// Traverse all path Rendering

For (FFFBezierPath * path in self. paths ){

[Path. lineColor set];

// Set the style

[Path setLineCapStyle: kCGLineCapRound];

[Path setLineJoinStyle: kCGLineJoinRound];

// Rendering

[Path stroke];

// NSLog (@ "% @", path );

}

}

 

@ End

 

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# Import "ViewController. h"

# Import "FFFPaintView. h"

@ Interface ViewController ()

 

@ Property (weak, nonatomic) IBOutlet FFFPaintView * paintView;

 

@ Property (weak, nonatomic) IBOutlet UISlider * slider;

 

@ Property (weak, nonatomic) IBOutlet UIButton * firstButton;

 

@ End

 

@ Implementation ViewController

//-(IBAction) slider :( UISlider *) sender {

//

// Self. paintView. lineWithed = sender. value;

//

//}

 

-(IBAction) savePaint {

// Enable the image Context

Uigraphicsbeginimagecontextwitexceptions (self. paintView. bounds. size, NO, 0 );

// Obtain the current context

CGContextRef ctx = UIGraphicsGetCurrentContext ();

// Draw the style of the current view to the context

[Self. paintView. layer renderInContext: ctx];

// Save the image to the album and obtain the image from the context

UIImageWriteToSavedPhotosAlbum (UIGraphicsGetImageFromCurrentImageContext (), nil );

// Close the context

UIGraphicsEndImageContext ();

}

 

// Clear screen

-(IBAction) clearScreen {

[Self. paintView clearScreen];

}

// Rollback

-(IBAction) recede {

[Self. paintView recede];

}

// Eraser

-(IBAction) eraser {

[Self. paintView eraser];

}

 

-(Void) viewDidLoad {

[Super viewDidLoad];

[Self. paintView setLineWithBlock: ^ CGFloat {

Return self. slider. value;

}];

Self. paintView. lineColor = self. firstButton. backgroundColor;

}

 

-(IBAction) setColorSelected :( UIButton *) sender {

Self. paintView. lineColor = sender. backgroundColor;

}

@ End

 

 

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