Simple Graffiti Board

Delegate.h

@property (Retain, nonatomic) UIWindow *window;

Delegate.m

-(void) dealloc{

[_window release];

[Super Dealloc];

}

-(BOOL) Application: (UIApplication *) application didfinishlaunchingwithoptions: (Nsdictionary *) launchOptions {

Self.window = [[[UIWindow alloc] Initwithframe:[[uiscreen Mainscreen] bounds]]autorelease];

Override point for customization after application launch.

Self.window.backgroundColor = [Uicolor Whitecolor];

[Self.window makekeyandvisible];

Mainviewcontroller *MAINVC = [[[Mainviewcontroller alloc]init]autorelease];

Self.window.rootViewController = MAINVC;

return YES;

}

Creating the Linemode Class

LineMode.h

@interface Linemodel:nsobject

@property (Nonatomic,retain) Uibezierpath *path; Record touch traces using Bezier curves

@property (Nonatomic,retain) Uicolor *color; Line Color

@property (nonatomic,assign) cgfloat width; Line width

@end

Linemode.m

-(void) dealloc{

[_path release];

[_color release];

[Super Dealloc];

}

Create a paintview that belongs to UIView

PaintView.h

@property (Nonatomic,retain) Nsmutablearray *alllines; Used to save all line objects on the artboard.

@property (Nonatomic,retain) Uicolor *linecolor; The color of the current line

@property (nonatomic,assign) cgfloat linewidth; The width of the current line

-(void) undolastdrawing; Undo Last Draw

-(void) Allclean; Empty artboard

paintview.m

#import "PaintView.h"

#import "LineModel.h"

@implementation Paintview

-(void) dealloc{

[_alllines release];

[_linecolor release];

[Super Dealloc];

}

-(Nsmutablearray *) alllines{

if (!_alllines) {

Self.alllines = [Nsmutablearray array];

}

return _alllines;

}

-(void) Touchesbegan: (Nsset *) touches withevent: (uievent *) event{

Uitouch *atouch = Touches.anyobject;

Cgpoint startPoint = [Atouch LocationInView:self.superview];

Creates a Bezier object and sets the starting point of the curve.

Uibezierpath*bezierpath=[uibezierpath Bezierpath];

[Bezierpath Movetopoint:startpoint];

Create a line model object and save three of the line's data

Linemodel*line=[[[linemodel Alloc]init]autorelease];

Line.path=bezierpath;

Line.color=self.linecolor;

Line.width=self.linewidth;

[Self.alllines Addobject:line];

}

-(void) touchesmoved: (Nsset *) touches withevent: (uievent *) event{

Uitouch *atouch = Touches.anyobject;

Cgpoint currentpoint =[atouch LocationInView:self.superview];

Gets the corresponding line model (the last object of the array corresponds to the curve currently being drawn during the touch move)

Linemodel *aline = Self.allLines.lastObject;

[Aline.path Addlinetopoint:currentpoint];

[Self setneedsdisplay]; Calling this method is the notification view, drawing the interface, and once this method is called, the system automatically calls the DrawRect: method to draw the interface.

}

Only override Drawrect:if perform custom drawing.

An empty implementation adversely affects performance during animation.

-(void) DrawRect: (cgrect) Rect {

Drawing Code

For (Linemodel *aline in Self.alllines) {

Set Fill Color

[Aline.color Setstroke];

Set the line width when drawing

[Aline.path SetLineWidth:aLine.width];

[Aline.path stroke]; Start Drawing Curves

}

}

-(void) undolastdrawing{

[Self.alllines Removelastobject];

[Self setneedsdisplay]; Removes the last Curve object in the array and redraws the interface.

}

-(void) allclean{

[Self.alllines removeallobjects];

[Self setneedsdisplay];

}

@end

Created by Mainviewcontroller

Mainviewcontroller.m

-(void) loadview{

Paintview *painview = [[Paintview alloc]initwithframe:[[uiscreen Mainscreen]bounds]];

Painview.backgroundcolor = [Uicolor Whitecolor];

Painview.linewidth = 5;

Painview.linecolor = [Uicolor blackcolor];

Self.view = Painview;

[Painview release];

}

-(void) Viewdidload {

[Super Viewdidload];

Do any additional setup after loading the view.

Create a menu button

UIButton *menubutton = [UIButton Buttonwithtype:uibuttontypesystem];

Menubutton.frame = CGRectMake (Cgrectgetwidth (self.view.bounds)-80, 40, 60, 40);

[Menubutton settitle:@ "menu" forstate:uicontrolstatenormal];

[Menubutton addtarget:self Action: @selector (handlemenubuttonaction:) forcontrolevents:uicontroleventtouchupinside ];

[Self.view Addsubview:menubutton];

Uitextfield *textfield = [[Uitextfield Alloc]initwithframe:cgrectzero];

Textfield.tag = 123;

[Self.view Addsubview:textfield];

[TextField release];

UIView *inputview = [[UIView alloc]initwithframe:cgrectmake (0, 0, cgrectgetwidth (self.view.bounds), 60)];

Inputview.backgroundcolor = [Uicolor Whitecolor];

Textfield.inputview = Inputview;

[Inputview release];

Nsarray *titles = @[@ "Decrease", @ "Increase", @ "undo", @ "empty", @ "color"];

CGFloat width = (cgrectgetwidth (self.view.bounds) -20*6)/5;

CGFloat height = width;

CGFloat originy = (60-height)/2;

CGFloat Originx = 20;

for (int i = 0; i<titles.count; i++) {

UIButton *button = [UIButton Buttonwithtype:uibuttontypesystem];

Button.tag = 100+i;

Button.frame = CGRectMake (originx+ (Width+originx) *i, originy, width, height);

[Button settitle:titles[i] forstate:uicontrolstatenormal];

Button.backgroundcolor = [Uicolor colorwithred:arc4random ()%256/255.0 green:arc4random ()%256/255.0 blue:arc4random ( )%256/255.0 alpha:0.6];

[Button Settitlecolor:[uicolor Whitecolor] forstate:uicontrolstatenormal];

Sets the corner radius of the button, which is half the width of the button

Button.layer.cornerRadius = width/2.0;

Button.layer.masksToBounds = YES; Crops the view by the specified radius.

[Button addtarget:self action: @selector (handlebuttonaction:) forcontrolevents:uicontroleventtouchupinside];

[Inputview Addsubview:button];

}

}

-(void) Handlemenubuttonaction: (UIButton *) sender{

Get TextField

Uitextfield *textfield = (Uitextfield *) [Self.view viewwithtag:123];

Determine if TextField is currently the first responder, revoke its first responder permission, or make it the first responder.

if (Textfield.isfirstresponder) {

[TextField Resignfirstresponder];

}else{

[TextField becomefirstresponder];//becomes the first responder

}

}

-(void) Handlebuttonaction: (UIButton *) sender{

Paintview *paintview = (Paintview *) Self.view; Get artboard View

Switch (Sender.tag) {

Case 100:

if (Paintview.linewidth > 2) {

Paintview.linewidth-=1;

}

Break

Case 101:

Paintview.linewidth +=1;

Break

Case 102:

[Paintview undolastdrawing];

Break

Case 103:

[Paintview Allclean];

Break

Case 104:

Sender.backgroundcolor = [Uicolor colorwithred:arc4random ()%256/255.0 green:arc4random ()%256/255.0 blue:arc4random ( )%256/255.0 Alpha:1];

Set Brush color

Paintview.linecolor = Sender.backgroundcolor;

Break

Default

Break

}

}

Simple Graffiti Board