几个经常需要自定义的组件：UIScrollview、UItextView、UIButton

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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];

}

//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];

}

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