画分割线

 1 //
 2 //  ViewController.m
 3 //  背景平铺
 4 //
 5 //  Created by zjj on 15/7/4.
 6 //  Copyright (c) 2015年 zjj. All rights reserved.
 7 //
 8
 9 #import "ViewController.h"
10
11 @interface ViewController ()
12 @property (weak, nonatomic) IBOutlet UITextView *textViewsLine;
13
14 @end
15
16 @implementation ViewController
17
18 - (void)viewDidLoad {
19     [super viewDidLoad];
20     [self testViewLine];
21 //    [self testBgLine];
22 //    [self testsBg];
23 }
24 /**
25  *  给指定控件设置分割线
26  */
27 - (void)testViewLine
28 {
29     CGFloat rowW = self.view.frame.size.width;
30     CGFloat rowH = 30;//self.textViewsLine.font.lineHeight;
31     // 创建一行背景图片
32     UIGraphicsBeginImageContextWithOptions(CGSizeMake(rowW, rowH), NO, 0.0);
33     // 取出上下文
34     CGContextRef ctx = UIGraphicsGetCurrentContext();
35     // 画个矩形框
36     [[UIColor whiteColor] set];
37     CGContextAddRect(ctx, CGRectMake(0, 0, rowW, rowH));
38     CGContextFillPath(ctx);
39     // 画线
40     [[UIColor blueColor] set];
41     CGFloat dividerX = 10;// 分割线与屏幕两边的间距
42     CGFloat lineWidth = 2;
43     CGContextSetLineWidth(ctx, lineWidth);//设定线宽
44     CGFloat dividerY = rowH - lineWidth;// Y值为背景图高度减去线宽度
45     CGContextMoveToPoint(ctx, dividerX, dividerY);
46     CGContextAddLineToPoint(ctx, rowW - dividerX, dividerY);
47     CGContextStrokePath(ctx);
48     // 取图
49     UIImage *newImg = UIGraphicsGetImageFromCurrentImageContext();
50     // 结束上下文
51     UIGraphicsEndImageContext();
52     self.textViewsLine.backgroundColor = [UIColor colorWithPatternImage:newImg];
53 }
54 /**
55  *  画 类似通讯录分割线
56  */
57 - (void)testBgLine
58 {
59     CGFloat rowW = self.view.frame.size.width;
60     CGFloat rowH = 44;
61     // 创建一行背景图片
62     UIGraphicsBeginImageContextWithOptions(CGSizeMake(rowW, rowH), NO, 0.0);
63     // 取出上下文
64     CGContextRef ctx = UIGraphicsGetCurrentContext();
65     // 画个矩形框
66     [[UIColor whiteColor] set];
67     CGContextAddRect(ctx, CGRectMake(0, 0, rowW, rowH));
68     CGContextFillPath(ctx);
69     // 画线
70     [[UIColor blueColor] set];
71     CGFloat dividerX = 10;// 分割线与屏幕两边的间距
72     CGFloat lineWidth = 2;
73     CGContextSetLineWidth(ctx, lineWidth);//设定线宽
74     CGFloat dividerY = rowH - lineWidth;// Y值为背景图高度减去线宽度
75     CGContextMoveToPoint(ctx, dividerX, dividerY);
76     CGContextAddLineToPoint(ctx, rowW - dividerX, dividerY);
77     CGContextStrokePath(ctx);
78     // 取图
79     UIImage *newImg = UIGraphicsGetImageFromCurrentImageContext();
80     // 结束上下文
81     UIGraphicsEndImageContext();
82     self.view.backgroundColor = [UIColor colorWithPatternImage:newImg];
83 }
84 

85 /**
86  *  将任意一张图 在不修改尺寸情况下 拉伸平铺到屏幕上
87  */
88 - (void)testsBg
89 {
90     UIImage *oldImg = [UIImage imageNamed:@"金币啊"];
91     UIGraphicsBeginImageContextWithOptions(self.view.frame.size, NO, 0.0);
92     [oldImg drawInRect:self.view.bounds];
93     UIImage *newImg = UIGraphicsGetImageFromCurrentImageContext();
94     UIGraphicsEndImageContext();
95     self.view.backgroundColor = [UIColor colorWithPatternImage:newImg];
96 }
97 @end