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 plaincopy
//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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