Apple iOS Uilabel text Marquee effect

In the actual development process, we will encounter such a situation, a sentence is too long, the display is not complete, the most typical is the navigation bar to display the title text, if too long text will appear incomplete situation, with Uilabel can achieve the effect of the horse, the text display integrity. The specific code is as follows:

The code is as follows

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#pragma mark-Animation -(void) startanimationifneeded{ Cancel, stop all animations [Titlelabel.layer removeallanimations]; The Titlelabel here is to implement the label of the marquee text Cgsize size = Cgsizemake (320,2000); Set a row height limit Cgsize textsize = [Titlelabel.text SizeWithFont:titleLabel.font]; Nsdictionary *attribute = @{nsfontattributename:titlelabel.font}; Cgsize textsize = [Titlelabel.text boundingrectwithsize:size options:nsstringdrawingtruncateslastvisibleline Attributes:attribute context:nil].size; CGRect lframe = titlelabel.frame; Lframe.size.width = Textsize.width; Titlelabel.frame = Lframe; Const float Oriwidth = 10; if (Textsize.width > Oriwidth) { float offset = textsize.width-oriwidth; [UIView animatewithduration:18.0 delay:0 Options Uiviewanimationoptionrepeat//Animation duplicate main switch //         | Uiviewanimationoptionautoreverse//Animation repeat automatically reverse, need to use with the above this | Uiviewanimationoptioncurvelinear//Animation time curve, scrolling subtitles linear more reasonable animations:^{ Titlelabel.transform = cgaffinetransformmaketranslation (-offset-400, 0); } completion:^ (BOOL finished) { } ]; } }

Note: Running distance can be based on their own needs of the method to modify the speed of the animation can also be modified, the effect looks good.

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The code is as follows

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-(void) Viewdidload { Uilabel *label1 = [[Uilabel alloc]initwithframe:cgrectmake (50.0, 20.0, 200.0, 50.0)]; Uilabel *label2 = [[Uilabel alloc]initwithframe:cgrectmake (50.0, 80.0, 200.0, 50.0)]; Uilabel *label3 = [[Uilabel alloc]initwithframe:cgrectmake (50.0, 140.0, 200.0, 50.0)]; Uilabel *label4 = [[Uilabel alloc]initwithframe:cgrectmake (50.0, 200.0, 200.0, 50.0)]; Uilabel *label5 = [[Uilabel alloc]initwithframe:cgrectmake (50.0, 260.0, 200.0, 50.0)]; Uilabel *label6 = [[Uilabel alloc]initwithframe:cgrectmake (50.0, 320.0, 200.0, 50.0)]; Uilabel *LABEL7 = [[Uilabel alloc]initwithframe:cgrectmake (50.0, 380.0, 200.0, 50.0)]; Set display text Label1.Text = @ "Label1"; Label2.Text = @ "Label2"; Label3.text = @ "label3--label3--label3--label3--label3--label3--label3--label3--label3--label3--label3--"; Label4.text = @ "label4--label4--label4--label4--"; Label5.text = @ "label5--label5--label5--label5--label5--label5--"; Label6.text = @ "Label6"; Label7.text = @ "Label7"; Set font: Bold, Normal is systemfontofsize Label1.font = [Uifont boldsystemfontofsize:20]; Set Text color Label1.textcolor = [Uicolor Orangecolor]; Label2.textcolor = [Uicolor Purplecolor]; Set Text position Label1.textalignment = Uitextalignmentright; Label2.textalignment = Uitextalignmentcenter; Set font size to fit label width Label4.adjustsfontsizetofitwidth = YES; Set the number of lines for a label Label5.numberoflines = 2; Uilabel.backgroudcolor=[uicolor Clearcolor]; You can remove the background color Setting highlighting label6.highlighted = YES; Label6.highlightedtextcolor = [Uicolor Orangecolor]; Set Shadow Label7.shadowcolor = [Uicolor Redcolor]; Label7.shadowoffset = Cgsizemake (1.0,1.0); Setting whether to interact with the user label7.userinteractionenabled = YES; Sets whether the text in the label is variable and the default is Yes label3.enabled = NO; Set the display format for text that is too long Label3.linebreakmode = uilinebreakmodemiddletruncation;//to intercept the middle typedef enum { Uilinebreakmodewordwrap = 0, Uilinebreakmodecharacterwrap, uilinebreakmodeclip,//, cut off the extra parts. uilinebreakmodeheadtruncation,//, cut off the head. uilinebreakmodetailtruncation,//, cut the tail. uilinebreakmodemiddletruncation,//, intercept the middle. } Uilinebreakmode; If the Adjustsfontsizetofitwidth property is set to Yes, this property controls the behavior of the text baseline Label4.baselineadjustment = Uibaselineadjustmentnone; typedef enum { Uibaselineadjustmentalignbaselines, Uibaselineadjustmentaligncenters, Uibaselineadjustmentnone, } uibaselineadjustment; [Self.view Addsubview:label1]; [Self.view Addsubview:label2]; [Self.view Addsubview:label3]; [Self.view Addsubview:label4]; [Self.view Addsubview:label5]; [Self.view Addsubview:label6]; [Self.view ADDSUBVIEW:LABEL7]; [Label1 release]; [Label2 release]; [Label3 release]; [Label4 release]; [Label5 release]; [Label6 release]; [Label7 release]; [Super Viewdidload]; } /* Override to allow orientations than the default portrait orientation. -(BOOL) Shouldautorotatetointerfaceorientation: (uiinterfaceorientation) interfaceorientation { Return YES to supported orientations return (interfaceorientation = = uiinterfaceorientationportrait); } */ -(void) didreceivememorywarning { Releases the view if it doesn ' t have a superview. [Super didreceivememorywarning]; Release any cached of data, images, etc that aren ' t in use. } -(void) Viewdidunload { Release any retained subviews of the main view. e.g. Self.myoutlet = nil; } -(void) Dealloc { [Super Dealloc]; } @end