(source code) Cat Learn iOS (34) Implementation of QUARTZ2D drawing board of UI

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Address: http://blog.csdn.net/u013357243?viewmode=contents
Source: http://download.csdn.net/detail/u013357243/8666923

Effect:

Code: Nyview

NYView.h

////  NYView.h//  画画板////  Created by apple on 15-5-6.//  Copyright (c) 2015年 znycat. All rights reserved.//#import <UIKit/UIKit.h>@interface NYView : UIView- (void)clearView;- (void)backView;@end

nyview.m

////NYVIEW.M//drawing board////Created by Apple on 15-5-6.//Copyright (c) 2015 Znycat. All rights reserved.//#import "NYView.h"  @interface nyview ()@property(nonatomic,Strong)Nsmutablearray*paths;@end @implementation nyview - (Nsmutablearray*) paths{if(_paths = =Nil) {_paths = [NsmutablearrayArray]; }return_paths;}//Start Touch- (void) Touchesbegan: (Nsset *) touches withevent: (uievent *) event{//1. Get the finger corresponding to the Uitouch objectUitouch *touch = [touches anyobject];//2. Get the position of finger touch via Uitouch object    CgpointStartPoint = [Touch Locationinview:touch. View];//3. Create a path when the user's finger is pressedUibezierpath *path = [Uibezierpath Bezierpath];//3.1 Set the related properties of the path[Path Setlinejoinstyle:kcglinejoinround];    [Path Setlinecapstyle:kcglinecapround]; [Path Setlinewidth:Ten];//4. Set the starting point of the current path[Path Movetopoint:startpoint];//5. Add the path to the array[ Self. PathsAddobject:path];}//Mobile- (void) touchesmoved: (Nsset *) touches withevent: (uievent *) event{//1. Get the finger corresponding to the Uitouch objectUitouch *touch = [touches anyobject];//2. Get the position of finger touch via Uitouch object    CgpointMovepoint = [Touch Locationinview:touch. View];//3. Remove the current pathUibezierpath *currentpaht = [ Self. PathsLastobject];//4. Set the end point of the current path[Currentpaht Addlinetopoint:movepoint];//6. Call the DrawRect method to return to the view[ SelfSetneedsdisplay];}//Leave view (Stop touch)- (void) touchesended: (Nsset *) touches withevent: (uievent *) event{[ SelfTouchesmoved:touches Withevent:event];/*//1. Get finger corresponding to Uitouch object Uitouch *touch = [touches anyobject];     2. Get the position of the finger touch through the Uitouch object cgpoint endPoint = [Touch LocationInView:touch.view];     3. Remove the current path Uibezierpath *currentpaht = [Self.paths lastobject];     4. Set the end point of the current path [Currentpaht Addlinetopoint:endpoint];     6. Call the DrawRect method to return to the view [self setneedsdisplay]; */}//Draw line- (void) DrawRect: (CGRect) rect{[[UicolorRedcolor] set];//Edge group to draw all segments     for(Uibezierpath *path in Self. Paths) {[path stroke]; }}- (void) clearview{[ Self. PathsRemoveallobjects]; [ SelfSetneedsdisplay];} - (void) backview{[ Self. PathsRemovelastobject]; [ SelfSetneedsdisplay];}@end

Nyviewcontroller

////NYVIEWCONTROLLER.M//drawing board////Created by Apple on 15-5-6.//Copyright (c) 2015 Znycat. All rights reserved.//#Import "NYViewController.h"#Import "NYView.h"#Import "Mbprogresshud+nj.h"#Import "Uiimage+captureview.h"@interfaceNyviewcontroller ()/** * Clear screen * *-(ibaction) Clearbtnclick;/** * Fallback * *-(ibaction) Backbtnclick;/** * Save * *-(ibaction) Savebtnclick;@property(Weak, nonatomic) Iboutlet Nyview *customview;@end@implementationnyviewcontroller-(ibaction) Clearbtnclick {[Self.customview clearView];} -(Ibaction) Backbtnclick {[Self.customview backview];} -(Ibaction) Savebtnclick {UIImage *newimage = [UIImage CaptureImageWithView:self.customView];//4. Save to albumUiimagewritetosavedphotosalbum (NewImage, Self,@selector(image:didFinishSavingWithError:contextInfo:), nil);} - (voidImage: (UIImage *) image didfinishsavingwitherror: (nserror *) Error ContextInfo: (void*) contextinfo{if(Error) {[Mbprogresshud showerror:@"Save Failed"]; }Else{[Mbprogresshud showsuccess:@"saved successfully"]; }}@end

Others can be seen in the source code, these two are the most important.

(source code) Cat Learn iOS (34) Implementation of QUARTZ2D drawing board of UI