Draw a line in IOS

In my project, a new uiview class is created after the map class.

. H file

# Import <uikit/uikit. h>

# DEFINE _ weith 320/3.

# DEFINE _ height 330/3

@ Interface view: uiview

@ End

. M file

//

// View. m

// 122chezhu01

//

// Created by Xumin on 7/8/13.

// Copyright (c) 2013 Xumin. All rights reserved.

//

# Import "view. H"

@ Implementation View

-(ID) initwithframe :( cgrect) Frame

{

Self = [Super
Initwithframe: frame];

If (Self ){

Self. backgroundcolor = [uicolor
Clearcolor];

}

Return
Self;

}

// Only override drawrect: If you perform custom drawing.

// An empty implementation adversely affects performance during animation.

-(Void) drawrect :( cgrect) rect

{

Cgcontextref context =
Uigraphicsgetcurrentcontext ();

Cgcontextsetstrokecolorwithcolor (context, [uicolor
Bluecolor]. cgcolor );

Cgcontextmovetopoint (context,
0, _ height );

Cgcontextaddlinetopoint (context,
320,
_ Height );

Cgcontextmovetopoint (context,
0, _ height * 2 );

Cgcontextaddlinetopoint (context,
320,
_ Height * 2 );

Cgcontextmovetopoint (context,
_ Weith,
0 );

Cgcontextaddlinetopoint (context,
_ Weith,
Self. Frame. Size. Height );

Cgcontextmovetopoint (context,
_ Weith * 2,
0 );

Cgcontextaddlinetopoint (context,
_ Weith * 2,
Self. Frame. Size. Height );

Cgcontextstrokepath (context );

Cgcontextclosepath (context );

}

@ End

Draw a straight line of the 9th Grid