iOS开发教学白板，互动版本，画画功能实现（类似于你画我猜功能）

iOS小伙伴们有时候是不是会遇到开发时需要实现实时连接的画画功能呢？类似于你画我猜！这个开发功能可以用于直播软件和在线教育软件里面

刚好我公司项目最近有这个功能，今天刚开发完，跟大家分享一下心得和方法，首先这个功能的实现其实就三个步骤

1：公司拥有自己的socket服务器，这是基础，实时链接数据

2：画画功能，画画功能其实就是把自己在屏幕视图上滑过的地方的点记录起来，根据CAShapeLayer和UIBezierPath进行描点画画

3：最后就是数据传输，需要我们在每次滑动的时候就把手指经历过的地方的点发送给对方，这就需要把点加载进数组里面，然后把数组转化为二进制数据发送给对方，具体要求看产品需求

最后直接上代码和效果图，有需要的小伙伴可以互相探讨哦

绘画代码：

// WhiteBoardDrawView.h

// NIM

// Created by 赵发生 on 15/7/1.

#import <UIKit/UIKit.h>

@interface NTESWhiteboardDrawView : UIView

- (void)setLineColor:(UIColor *)color;

- (void)setLineWidth:(CGFloat)width;

- (void)addPoints:(NSMutableArray *)points isNewLine:(BOOL)newLine;

- (void)deleteLastLine;

- (void)clear;

@end

#import "NTESWhiteboardDrawView.h"

#import <QuartzCore/QuartzCore.h>

#import "NTESCADisplayLinkHolder.h"

@interface NTESWhiteboardDrawView()<NTESCADisplayLinkHolderDelegate>

@property(nonatomic, strong)NSMutableArray *myLines;

@property(nonatomic, assign)BOOL shouldDraw;

@property(nonatomic, strong)NTESCADisplayLinkHolder *displayLinkHolder;

@end

@implementation NTESWhiteboardDrawView

#pragma mark - public methods

- (id)initWithFrame:(CGRect)frame

{

if (self = [super initWithFrame:frame]) {

_myLines = [[NSMutableArray alloc] init];

CAShapeLayer *shapeLayer = (CAShapeLayer *)self.layer;

shapeLayer.strokeColor = [UIColor blackColor].CGColor;

shapeLayer.fillColor = [UIColor clearColor].CGColor;

shapeLayer.lineJoin = kCALineJoinRound;

shapeLayer.lineCap = kCALineCapRound;

shapeLayer.lineWidth = 2;

shapeLayer.masksToBounds = YES;

_displayLinkHolder = [[NTESCADisplayLinkHolder alloc] init];

[_displayLinkHolder setFrameInterval:3];

[_displayLinkHolder startCADisplayLinkWithDelegate:self];

}

return self;

}

-(void)dealloc

{

[_displayLinkHolder stop];

}

+ (Class)layerClass

{

return [CAShapeLayer class];

}

- (void)setLineColor:(UIColor *)color

{

CAShapeLayer *shapeLayer = (CAShapeLayer *)self.layer;

shapeLayer.strokeColor = color.CGColor;

}

- (void)setLineWidth:(CGFloat)width{

CAShapeLayer *shapeLayer = (CAShapeLayer *)self.layer;

shapeLayer.lineWidth = width;

}

- (void)addPoints:(NSMutableArray *)points isNewLine:(BOOL)newLine

{

__weak typeof(self) wself = self;

dispatch_async(dispatch_get_main_queue(), ^{

[wself addPoints:points toLines:[wself myLines] isNewLine:newLine];

});

}

- (void)deleteLastLine

{

__weak typeof(self) wself = self;

dispatch_async(dispatch_get_main_queue(), ^{

[wself deleteLastLine:[wself myLines]];

});

}

- (void)deleteAllLines

{

__weak typeof(self) wself = self;

dispatch_async(dispatch_get_main_queue(), ^{

[wself deleteAllLines:[wself myLines]];

});

}

- (void)clear

{

[self deleteAllLines];

}

#pragma mark - private methods

- (void)addPoints:(NSMutableArray *)points

toLines:(NSMutableArray *)lines

isNewLine:(BOOL)newLine

{

if (newLine) {

[lines addObject:points];

}

else if (lines.count == 0) {

[lines addObject:points];

}

else {

NSMutableArray *lastLine = [lines lastObject];

[lastLine addObjectsFromArray:points];

}

_shouldDraw = YES;

}

-(void)deleteLastLine:(NSMutableArray *)lines

{

[lines removeLastObject];

_shouldDraw = YES;

}

-(void)deleteAllLines:(NSMutableArray *)lines

{

[lines removeAllObjects];

_shouldDraw = YES;

}

- (void)onDisplayLinkFire:(NTESCADisplayLinkHolder *)holder

duration:(NSTimeInterval)duration

displayLink:(CADisplayLink *)displayLink

{

if (!_shouldDraw) {

return;

}

UIBezierPath *path = [[UIBezierPath alloc] init];

NSUInteger linesCount = _myLines.count;

for (NSUInteger i = 0 ; i < linesCount; i ++) {

NSArray *line = [_myLines objectAtIndex:i];

NSUInteger pointsCount = line.count;

for (NSUInteger j = 0 ; j < pointsCount; j ++) {

NSArray *point = [line objectAtIndex:j];

CGPoint p = CGPointMake([point[0] floatValue], [point[1] floatValue]);

if (j == 0) {

[path moveToPoint:p];

}

else {

[path addLineToPoint:p];

}

((CAShapeLayer *)self.layer).path = path.CGPath;

_shouldDraw = NO;

}

#import <Foundation/Foundation.h>

#import <UIKit/UIKit.h>

@class NTESCADisplayLinkHolder;

@protocol NTESCADisplayLinkHolderDelegate <NSObject>

- (void)onDisplayLinkFire:(NTESCADisplayLinkHolder *)holder

duration:(NSTimeInterval)duration

displayLink:(CADisplayLink *)displayLink;

@end

@interface NTESCADisplayLinkHolder : NSObject

@property (nonatomic,weak ) id<NTESCADisplayLinkHolderDelegate> delegate;

@property (nonatomic,assign) NSInteger frameInterval;

- (void)startCADisplayLinkWithDelegate: (id<NTESCADisplayLinkHolderDelegate>)delegate;

- (void)stop;

@end

#import "NTESCADisplayLinkHolder.h"

@implementation NTESCADisplayLinkHolder

{

CADisplayLink *_displayLink;

}

- (instancetype)init

{

if (self = [super init]) {

_frameInterval = 1;

}

return self;

}

- (void)dealloc

{

[self stop];

_delegate = nil;

}

- (void)startCADisplayLinkWithDelegate:(id<NTESCADisplayLinkHolderDelegate>)delegate

{

_delegate = delegate;

[self stop];

_displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(onDisplayLink:)];

[_displayLink setFrameInterval:_frameInterval];

[_displayLink addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSRunLoopCommonModes];

}

- (void)stop

{

if (_displayLink){

[_displayLink invalidate];

_displayLink = nil;

}

- (void)onDisplayLink: (CADisplayLink *) displayLink

{

if (_delegate && [_delegate respondsToSelector:@selector(onDisplayLinkFire:duration:displayLink:)]){

[_delegate onDisplayLinkFire:self

duration:displayLink.duration

displayLink:displayLink];

}

画画例子:

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event

{

if (!self.isConnect) {

return;

}

if (!self.sessionId) {

return;

}

CGPoint p = [[touches anyObject] locationInView:self.callView.myDrawView];

[self onPointCollected:p type:WhiteBoardCmdTypePointEnd];

}

- (void)onPointCollected:(CGPoint)p type:(WhiteBoardCmdType)type

{

//send to peer

NSString *cmd = [NSString stringWithFormat:@"%zd:%.3f,%.3f;", type, p.x/self.callView.myDrawView.frame.size.width, p.y/self.callView.myDrawView.frame.size.height];

[self addCmd:cmd];

//local render

NSArray *point = [NSArray arrayWithObjects:@(p.x), @(p.y), nil];

[self.callView.myDrawView addPoints:[NSMutableArray arrayWithObjects:point, nil]

isNewLine:(type == WhiteBoardCmdTypePointStart)];

}

- (void)addCmd:(NSString *)aCmd

{

[_cmdsLock lock];

[_cmds appendString:aCmd];

[_cmdsLock unlock];

if ([_cmds length]) {

[self sendCmds];

}

hui

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