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2015/11/26
Day 41
今天开始学起触摸事件
在用户使用app过程中，会产生各种各样的事件
iOS中的事件可以分为3大类型
响应者对象
在iOS中不是任何对象都能处理事件，只有继承了UIResponder的对象才能接收并处理事件。我们称之为“响应者对象”
UIApplication、UIViewController、UIView都继承自UIResponder，因此它们都是响应者对象，都能够接收并处理事件
UIResponder内部提供了以下方法来处理事件
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event;
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event;
- (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event;
- (void)remoteControlReceivedWithEvent:(UIEvent *)event;
UIView是UIResponder的子类，可以覆盖下列4个方法处理不同的触摸事件
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
提示：touches中存放的都是UITouch对象
UITouch的作用
UITouch的属性
@property(nonatomic,readonly,retain) UIWindow *window;
@property(nonatomic,readonly,retain) UIView *view;
@property(nonatomic,readonly) NSUInteger tapCount;
@property(nonatomic,readonly) NSTimeInterval timestamp;
@property(nonatomic,readonly) UITouchPhase phase;
UITouch的方法
- (CGPoint)locationInView:(UIView *)view;
返回值表示触摸在view上的位置
这里返回的位置是针对view的坐标系的（以view的左上角为原点(0, 0)）
调用时传入的view参数为nil的话，返回的是触摸点在UIWindow的位置
- (CGPoint)previousLocationInView:(UIView *)view;
该方法记录了前一个触摸点的位置
UIEvent
常见属性
@property(nonatomic,readonly) UIEventType type;
@property(nonatomic,readonly) UIEventSubtype subtype;
@property(nonatomic,readonly) NSTimeInterval timestamp;
然后用上述4个方法做了一个涂鸦app
很简单，先自定义一个view
@interface YUView : UIView - (void)clear; - (void)back; @end
两个方法供控制器调用，重置和回退
@interface YUView () @property (nonatomic, strong) NSMutableArray *totalLines; @end
私有属性是个可变数组，里面装画过的所有线的路径
实现代码如下
@implementation YUView - (NSMutableArray *)totalLines { if (_totalLines == nil) { _totalLines = [NSMutableArray array]; } return _totalLines; } - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; CGPoint point = [touch locationInView:touch.view]; UIBezierPath *currentPath = [UIBezierPath bezierPath]; [currentPath moveToPoint:point]; [self.totalLines addObject:currentPath]; [self setNeedsDisplay]; } - (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; CGPoint point = [touch locationInView:touch.view]; UIBezierPath *path = [self.totalLines lastObject]; [path addLineToPoint:point]; [self setNeedsDisplay]; } - (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event { [self touchesMoved:touches withEvent:event]; } - (void)drawRect:(CGRect)rect { [[UIColor blueColor] set]; for (UIBezierPath *path in self.totalLines) { path.lineWidth = 5; [path stroke]; } } - (void)clear { [self.totalLines removeAllObjects]; [self setNeedsDisplay]; } - (void)back { [self.totalLines removeLastObject]; [self setNeedsDisplay]; } @end
很简单，只要在触摸事件中存入触摸的点画线就行， 通过 [self setNeedsDisplay];重绘页面
重置只需清空路径数组，回退只需删除数组中最后一个路径即可
之前一直看swift文档，实在是太无聊，于是乎我决定把这个涂鸦用swift重构一遍,如下
class YUView : UIView {
var paths:[UIBezierPath] = []
func back() {
self.paths.removeLast()
self.setNeedsDisplay()
}
func clear() {
self.paths.removeAll()
self.setNeedsDisplay()
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
let touch = touches.first
let point = touch?.locationInView(touch?.view)
let currrentPath = UIBezierPath.init()
currrentPath.moveToPoint(point!)
self.paths.append(currrentPath)
self.setNeedsDisplay()
}
override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
let touch = touches.first
let point = touch?.locationInView(touch?.view)
let path = self.paths.last
path?.lineJoinStyle = .Round
path?.lineCapStyle = .Round
path!.addLineToPoint(point!)
self.setNeedsDisplay()
}
override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
self.touchesMoved(touches, withEvent: event)
}
override func drawRect(rect: CGRect) {
UIColor.init(red: 0, green: 0, blue: 1, alpha: 1).set()
for path in self.paths {
path.lineWidth = 8
path.stroke()
}
}
}
感觉第一次用上swift我就喜欢上它了，代码简洁而且对于我这样非常熟悉.语法的Java程序员非常亲切~
2015/11/27
Day 42
今天做了个手势解锁的页面
每个圆圈都是一个button通过改变状态改变图片，通过触摸事件画线就行了。
button最好别直接用UIButton，自己定义
@interface YUCircleView : UIButton @end @implementation YUCircleView - (instancetype)initWithCoder:(NSCoder *)aDecoder { if (self == [super initWithCoder:aDecoder]) { [self setup]; } return self; } - (instancetype)initWithFrame:(CGRect)frame { if (self == [super initWithFrame:frame]) { [self setup]; } return self; } - (void) setup { self.userInteractionEnabled = NO; [self setImage:[UIImage imageNamed:@"gesture_node_normal"] forState:UIControlStateNormal]; [self setImage:[UIImage imageNamed:@"gesture_node_highlighted"] forState:UIControlStateSelected]; } @end
重写那两个初始化方法使按钮不管什么方式创建都设置好图片，不能互动是为了取消按钮的高亮状态
把按钮放进自定义的view里
@interface YULockView () @property (nonatomic, strong) NSMutableArray *selectedViews; @property (nonatomic, assign) CGPoint currentPoint; @end
这两个私有属性，selectedViews里面保存被选中的按钮，currentPoint保存用户当前触摸的点
先把九个按钮加上去并且排布好，注意子控件的frame要在layoutSubviews方法中执行并且要调用[super layoutSubviews];
- (instancetype)initWithCoder:(NSCoder *)aDecoder { if (self == [super initWithCoder:aDecoder]) { [self setup]; } return self; } - (instancetype)initWithFrame:(CGRect)frame { if (self == [super initWithFrame:frame]) { [self setup]; } return self; } - (void) setup { for (int i = 0; i < 9; i++) { YUCircleView *circleView = [YUCircleView buttonWithType:UIButtonTypeCustom]; circleView.tag = i; [self addSubview:circleView]; } } - (void)layoutSubviews { [super layoutSubviews]; CGFloat viewH = 80; CGFloat viewW = 80; int totalcol = 3; for (int i = 0; i < self.subviews.count; i++) { YUCircleView *btn = self.subviews[i]; CGFloat padding = (self.bounds.size.width - totalcol * viewW) / (totalcol + 1); CGFloat viewX = padding * (i % totalcol + 1) + i % totalcol * viewW; CGFloat viewY = padding * (i / totalcol + 1) + i / totalcol * viewW; btn.frame = CGRectMake(viewX, viewY, viewW, viewH); } }
在处理触摸事件的四个方法中经常要得到用户当前触摸的点，以及得到用户触摸到的按钮这两个功能，把他们单独抽出来做为方法比较好
- (CGPoint)getTouchPoint:(NSSet<UITouch *> *)touches { UITouch *touch = [touches anyObject]; CGPoint point = [touch locationInView:touch.view]; self.currentPoint = point; return point; } - (YUCircleView *)getTouchBtn:(CGPoint)point { for (YUCircleView *btn in self.subviews) { CGFloat d = 50; CGFloat frameX = btn.center.x - d * 0.5; CGFloat frameY = btn.center.y - d * 0.5; if( CGRectContainsPoint(CGRectMake(frameX, frameY, d, d), point)) { return btn; } } return nil; }
触碰到圆心周围才判定触碰到按钮
于是触摸事件的方法如下
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event { CGPoint currentPoint = [self getTouchPoint:touches]; YUCircleView *btn = [self getTouchBtn:currentPoint]; if (btn && btn.selected == NO) { btn.selected = YES; [self.selectedViews addObject:btn]; } [self setNeedsDisplay]; } - (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event { CGPoint currentPoint = [self getTouchPoint:touches]; YUCircleView *btn = [self getTouchBtn:currentPoint]; if (btn && btn.selected == NO) { btn.selected = YES; [self.selectedViews addObject:btn]; } [self setNeedsDisplay]; } - (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event for (YUCircleView *btn in self.selectedViews) { btn.selected = NO; } [self.selectedViews removeAllObjects]; [self setNeedsDisplay]; } - (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event { [self touchesEnded:touches withEvent:event]; } - (void)drawRect:(CGRect)rect { if (self.selectedViews.count == 0) return; [[UIColor colorWithRed:32/255.0 green:210/255.0 blue:254/255.0 alpha:0.5] set]; UIBezierPath *path = [UIBezierPath bezierPath]; for (int i = 0; i < self.selectedViews.count; i++) { YUCircleView *btn = self.selectedViews[i]; if (i == 0) { [path moveToPoint:btn.center]; } else { [path addLineToPoint:btn.center]; } } [path addLineToPoint:self.currentPoint]; path.lineCapStyle = kCGLineCapRound; path.lineJoinStyle = kCGLineJoinBevel; path.lineWidth = 8; [path stroke]; }
drawRect方法中只要遍历所有选中的按钮再将他们的圆心依次相连就可以了，最后再连到用户当前触摸的点
这个解锁页面在用户画完后要拿到用户刚才画的路径进行操作的。
如何得到用户所画的路径呢？
这时候，初始化各个按钮给按钮绑定的tag就派上用场了，把每个选中的按钮的tag依次串成字符串就是路径啦，一般这个路径是要传出去的，由别人来操作，所以最好使用代理模式
首先声明代理协议
@class YULockView; @protocol YULockViewDelegate <NSObject> @optional - (void)lockView:(YULockView *)lockView didFinishPath:(NSString *)path; @end
在YULockView中加入代理属性
@interface YULockView : UIView @property(nonatomic, weak) IBOutlet id<YULockViewDelegate> delegate; @end
加入IBOutlet是为了我方便的连线设置代理
在touchesEnded方法中通知代理
- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event { // 通知代理 if ([self.delegate respondsToSelector:@selector(lockView:didFinishPath:)]) { NSMutableString *path = [NSMutableString string]; for (YUCircleView *btn in self.selectedViews) { [path appendFormat:@"%d", (int)btn.tag]; } [self.delegate lockView:self didFinishPath:path]; } for (YUCircleView *btn in self.selectedViews) { btn.selected = NO; } [self.selectedViews removeAllObjects]; [self setNeedsDisplay]; }
然后让控制器实现代理方法
@interface ViewController () <YULockViewDelegate> @end @implementation ViewController - (void)lockView:(YULockView *)lockView didFinishPath:(NSString *)path { NSLog(@"路径为：%@",path); } - (void)viewDidLoad { [super viewDidLoad]; } @end
随便画了一下控制台打印如下
2015-11-28 22:37:12.537 手势解锁-OC[835:45566] 路径为：13456780
接下来就用swift重新写了一遍
首先是自定义的button
class YUCircleView:UIButton {
override init(frame: CGRect) {
super.init(frame: frame)
self.setup()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
self.setup()
}
func setup() {
self.userInteractionEnabled = false;
self.setImage(UIImage(named: "gesture_node_normal"), forState: .Normal)
self.setImage(UIImage(named: "gesture_node_highlighted"), forState: .Selected)
}
}
接下来是自定义view的代码
public protocol YULockViewDelegate : NSObjectProtocol{
func didFinishPath(lockView:UIView,path:String)
}
class YULockView:UIView {
weak var delegate:YULockViewDelegate?
var selectedViews:[YUCircleView] = []
var currentPoint:CGPoint = CGPointZero
func getTouchPoint(touches: Set<UITouch>) -> CGPoint {
let touch = touches.first
let point = touch?.locationInView(touch?.view)
self.currentPoint = point!
return point!
}
func getTouchBtn(point:CGPoint) -> YUCircleView? {
for btn in self.subviews {
let d:CGFloat = 50;
let frameX = btn.center.x - d * 0.5;
let frameY = btn.center.y - d * 0.5;
if( CGRectContainsPoint(CGRectMake(frameX, frameY, d, d), point)) {
return btn as? YUCircleView;
}
}
return nil
}
override func drawRect(rect: CGRect) {
if self.selectedViews.count == 0 {return}
UIColor(colorLiteralRed: 32/255.0, green: 210/255.0, blue: 1.0, alpha: 0.5).set()
let path = UIBezierPath.init()
for var i = 0; i < self.selectedViews.count; i += 1 {
let btn = self.selectedViews[i]
if i == 0 {
path.moveToPoint(btn.center)
} else {
path.addLineToPoint(btn.center)
}
}
path.addLineToPoint(self.currentPoint)
path.lineCapStyle = .Round;
path.lineJoinStyle = .Bevel;
path.lineWidth = 8;
path.stroke()
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
let point = self.getTouchPoint(touches)
let btn = self.getTouchBtn(point)
if (btn != nil) && (btn!.selected == false) {
btn!.selected = true
self.selectedViews.append(btn!)
}
self.setNeedsDisplay()
}
override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
let point = self.getTouchPoint(touches)
let btn = self.getTouchBtn(point)
if (btn != nil) && (btn!.selected == false) {
btn!.selected = true
self.selectedViews.append(btn!)
}
self.setNeedsDisplay()
}
override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
if ((self.delegate?.respondsToSelector(Selector.init("didFinishPath:”))) != nil) {
var path = ""
for btn in self.selectedViews {
path += "\(btn.tag)"
}
self.delegate?.didFinishPath(self, path: path)
}
for item in self.selectedViews {
item.selected = false
}
self.selectedViews.removeAll()
self.setNeedsDisplay()
}
override func touchesCancelled(touches: Set<UITouch>?, withEvent event: UIEvent?) {
self.touchesEnded(touches!, withEvent: event)
}
override init(frame: CGRect) {
super.init(frame: frame)
self.setup()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
self.setup()
}
func setup() {
for var i = 0; i < 9; i += 1 {
let btn = YUCircleView(type: .Custom)
btn.tag = i
self.addSubview(btn)
}
}
override func layoutSubviews() {
super.layoutSubviews()
let viewH:CGFloat = 80
let viewW:CGFloat = 80
let totalcol:Int = 3
for var i = 0; i < self.subviews.count; i += 1 {
let col = i % totalcol
let row = i / totalcol
let paddingX = (self.bounds.size.width - CGFloat(totalcol) * viewW) / CGFloat(totalcol + 1)
let paddingY = paddingX
let viewX = paddingX + CGFloat(col) * (viewW + paddingX)
let viewY = paddingY + CGFloat(row) * (viewH + paddingY)
let btn = self.subviews[i] as! YUCircleView
btn.frame = CGRectMake(viewX, viewY, viewW, viewH)
}
}
}
总体来说思路是一样的，只是代码语法以及风格不同，个人偏爱swift一点，但是swift管类型比较严，不同类型的数据不能做运算，于是在layoutSubviews()方法中转换类型费了点劲，接着就是设置代理和实现代理方法了
class ViewController: UIViewController, YULockViewDelegate{
func didFinishPath(lockView: UIView, path: String) {
print("路径为："+path)
}
override func viewDidLoad() {
super.viewDidLoad()
for item in self.view.subviews {
if item is YULockView {
let lockView = item as! YULockView
lockView.delegate = self
}
}
}
}
随便画了一下控制台输出如下
路径为：840123675
标签：
原文地址：http://www.cnblogs.com/yu3-/p/5004882.html
