IOS Uipickerview may appear when the selected line does not show or remove the top and bottom two horizontal lines to solve the problem,

This problem is easy to solve, you need to set the color of the upper and lower lines in the Pickerview proxy method.

-(UIView *) Pickerview: (Uipickerview *) Pickerview Viewforrow: (nsinteger) Row forcomponent: (Nsinteger) component Reusingview: (UIView *) view{UILabel*label =[[UILabel alloc] init]; Label.frame= CGRectMake (0,0, _picker.frame.size.width, +); Label.font= [Uifont systemfontofsize: A]; if(Component = =0) {Label.text=Self.yeararray[row]; }Else if(Component = =1) {Label.text=Self.montharray[row]; }Else if(Component = =2) {Label.text=Self.dayarray[row]; } label.textalignment=Nstextalignmentcenter; //set the color of the horizontal line to show or hide((UILabel *) [_picker.subviews Objectatindex:1]). BackgroundColor =Finelinecolor; ((UILabel*) [_picker.subviews Objectatindex:2]). BackgroundColor =Finelinecolor; returnlabel;}

IOS Uipickerview may appear when the selected line does not show or remove the top and bottom two horizontal lines to solve the problem,