几个经常需要自定义的View总结

分类: Iphone应用开发 2011-12-28 15:13 136人阅读 评论(0) 收藏 举报

为了独立出组件的一些功能,如,为UIbutton切换背景图片,我们经常需要自定义一些组件,下面是我经常用到的,先总结出来,以后会慢慢更新:

-:UIScroview

srollview的事件经常与其子view事件冲突,截断子view事件的相应

//传递touch事件

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

{

   if(!self.dragging)

     

  {

        [[selfnextResponder]touchesBegan:toucheswithEvent:event];

  }

   

  [supertouchesBegan:touches withEvent:event];

   

  // NSLog(@"MyScrollView touch Began");

}

 

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

{

   if(!self.dragging)

  {

        [[selfnextResponder]touchesMoved:toucheswithEvent:event];

  }

  [supertouchesMoved:touches withEvent:event];

}

 

 

 

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

{

   if(!self.dragging)

  {

        [[selfnextResponder]touchesEnded:toucheswithEvent:event];

  }

  [supertouchesEnded:touches withEvent:event];

}

 
[plain] view plain copy
  1.   


 

//父视图是否可以将消息传递给子视图,yes是将事件传递给子视图,则不滚动,no是不传递则继续滚动

- (BOOL)touchesShouldBegin:(NSSet *)touches withEvent:(UIEvent *)event inContentView:(UIView *)view

{

  if ([view isKindOfClass:[CustomUITextViewclass]])

  {

     return YES;

  }

  else 

  {

    returnNO;

   

  }

 

}

 

//Yes是子视图取消继续接受touch消息(可以滚动),NO是子视图可以继续接受touch事件(不滚动)

//默认的情况下当view不是一个UIControlo类的时候,值是yes,否则是no 

//调用情况是这样的一般是在发送tracking messages消息后会调用这个函数,来判断scroll是否滚动,还是接受子视图的touch事件

- (BOOL)touchesShouldCancelInContentView:(UIView *)view

{

  NSLog(@"用户点击的视图 %@",view);

   returnNO;


二:UITextView默认是没有边框的,可以给它加个凹下去的边框

-(void) drawRect:(CGRect)rect {

   

    [self.layersetBackgroundColor: [[UIColorwhiteColor]CGColor]];

    [self.layersetBorderColor: [[UIColorgrayColor]CGColor]];

    [self.layersetBorderWidth:1.0];

    [self.layersetCornerRadius:8.0f];

    [self.layersetMasksToBounds:YES];

   UIGraphicsBeginImageContext(self.frame.size);

   CGContextRef currentContext =UIGraphicsGetCurrentContext();

  CGContextSetLineWidth(currentContext, 2.0);

  CGContextSetRGBStrokeColor(currentContext, 0.6,0.6,.6, 1.0);

  CGRect myRect = CGContextGetClipBoundingBox(currentContext);  

  float myShadowColorValues[] = {0,0,0,1};

   CGColorSpaceRef myColorSpace =CGColorSpaceCreateDeviceRGB();

  CGColorRef colorRef = CGColorCreate(myColorSpace, myShadowColorValues);

  CGContextSetShadowWithColor(currentContext, CGSizeMake(-1,1),2, colorRef);

   

  CGContextStrokeRect(currentContext, myRect);

   UIImage *backgroundImage = (UIImage *)UIGraphicsGetImageFromCurrentImageContext();

   UIImageView *myImageView = [[UIImageViewalloc]initWithFrame:CGRectMake(0,0,self.frame.size.width,self.frame.size.height)];

  [myImageView setImage:backgroundImage];

  [selfaddSubview:myImageView];

  [myImageView release];

   UIGraphicsEndImageContext();

}


三:我们会想按下按钮时,切换button的图片背景,可以给UIbutton加个UIControllEvent事件的消息通知,当按钮被按下的时候,通知按钮所有者去切换图片

- (id)initWithFrame:(CGRect)_frame  {

if (self = [superinitWithFrame:_frame]) {

[selfaddTarget:selfaction:@selector(touchDown:)forControlEvents:UIControlEventTouchDown];

[selfaddTarget:selfaction:@selector(touchUpInside:)forControlEvents:UIControlEventTouchUpInside];

//[selfaddTarget:selfaction:@selector(touchUpOutside:)forControlEvents:UIControlEventTouchUpOutside];

}

 

returnself;

}

 

- (void)touchDown:(id)sender {

NSNotification *notification = [NSNotificationnotificationWithName:@"TouchDownButton"object:selfuserInfo:nil];

[[NSNotificationCenterdefaultCenter]postNotification:notification];

NSLog(@"%s",__FUNCTION__);

}

 

- (void)touchUpInside:(id)sender {

//[self setBackgroundImage:@"next.png" forState:UIControlStateNormal];

NSNotification *notification = [NSNotificationnotificationWithName:@"TouchUpButton"object:selfuserInfo:nil];

[[NSNotificationCenterdefaultCenter]postNotification:notification];

 

}

使用方法
在所有者类中定义这些自定义的组件,如定义

CustomerButton *nextButton;

监听消息

[notification addObserver:self selector:@selector(touchDownNext) name:@"TouchDownButton" object:nil];

[notification addObserver:self selector:@selector(touchUpNext) name:@"TouchUpButton" object:nil];

监听到后需要执行的动作

-(void)touchDownNext{

UIImage *image = [UIImageimageNamed:@"next_pressed.png"];

[nextButtonsetBackgroundImage:imageforState:UIControlStateHighlighted];

}

 

-(void)touchUpNext{

UIImage *image = [UIImageimageNamed:@"next.png"];

[nextButtonsetBackgroundImage:imageforState:UIControlStateNormal];

}

不能上传附件,有需要的可以联系我

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