标签：
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;
}
创建LineMode类
LineMode.h
@interface LineModel : NSObject
@property(nonatomic,retain)UIBezierPath *path; //使用贝塞尔曲线记录触摸轨迹
@property(nonatomic,retain)UIColor *color ; //线条颜色
@property(nonatomic,assign)CGFloat width; //线条宽度
@end
LineMode.m
-(void)dealloc{
[_path release];
[_color release];
[super dealloc];
}
创建属于UIView的PaintView
PaintView.h
@property(nonatomic,retain)NSMutableArray *allLines; //用于保存画板上所有线条对象.
@property(nonatomic,retain)UIColor *lineColor; //当前线条的颜色
@property(nonatomic,assign)CGFloat lineWidth; //当前线条的宽度
-(void)undoLastDrawing; //撤销上次绘制
-(void)allClean; //清空画板
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];
//创建贝塞尔曲线对象,并设置曲线的起始点.
UIBezierPath*bezierPath=[UIBezierPath bezierPath];
[bezierPath moveToPoint:startPoint];
// 创建线条模型对象 并保存线条的三个数据
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];
//获取对应的线条模型(在触摸移动的过程中,数组的最后一个对象对应当前正在绘制的曲线)
LineModel *aLine = self.allLines.lastObject;
[aLine.path addLineToPoint:currentPoint];
[self setNeedsDisplay]; //调用此方法是通知视图,绘制界面,一旦调用此方法,系统就会自动调用drawRect:方法来绘制界面.
}
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
// Drawing code
for (LineModel *aLine in self.allLines) {
//设置填充颜色
[aLine.color setStroke];
//设置绘制时的线条宽度
[aLine.path setLineWidth:aLine.width];
[aLine.path stroke]; //开始绘制曲线
}
}
-(void)undoLastDrawing{
[self.allLines removeLastObject];
[self setNeedsDisplay]; //移除数组中的最后一条曲线对象,并重绘界面.
}
-(void)allClean{
[self.allLines removeAllObjects];
[self setNeedsDisplay];
}
@end
创建的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.
//创建菜单按钮
UIButton *menuButton = [UIButton buttonWithType:UIButtonTypeSystem];
menuButton.frame = CGRectMake(CGRectGetWidth(self.view.bounds)-80, 40, 60, 40);
[menuButton setTitle:@"菜单" 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 = @[@"减小",@"增大",@"撤销",@"清空",@"颜色"];
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];
//设置按钮的角半径,为按钮宽度的一半
button.layer.cornerRadius = width / 2.0;
button.layer.masksToBounds = YES; //按指定的半径裁剪视图.
[button addTarget:self action:@selector(handleButtonAction:) forControlEvents:UIControlEventTouchUpInside];
[inputView addSubview:button];
}
}
-(void)handleMenuButtonAction:(UIButton *)sender{
//获取textField
UITextField *textField = (UITextField *)[self.view viewWithTag:123];
//判断如果textField当前是第一响应者,则撤销其第一响应者权限,否则让其成为第一响应者.
if (textField.isFirstResponder) {
[textField resignFirstResponder];
}else{
[textField becomeFirstResponder];//成为第一响应者
}
}
-(void)handleButtonAction:(UIButton *)sender{
PaintView *paintView = (PaintView *)self.view; //获取画板视图
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];
//设置画笔颜色
paintView.lineColor = sender.backgroundColor;
break;
default:
break;
}
}
标签：
原文地址：http://www.cnblogs.com/lz824129/p/4891755.html
