iOS开发中Quartz2D绘图路径的使用以及条纹效果的实现

三、应用场景

完成一个简陋的电子书阅读器

代码：

复制代码
//
//  YYViewController.m
//  01-信纸条纹
//
//  Created by 孔医己 on 14-6-11.
//  Copyright (c) 2014年 itcast. All rights reserved.
//

 

#import "YYViewController.h"

@interface YYViewController ()

@property (weak, nonatomic) IBOutlet UITextView *textview;
- (IBAction)perBtnClick:(UIButton *)sender;
- (IBAction)nextBtnClick:(UIButton *)sender;
@property(nonatomic,assign)int index;
@end

复制代码
@implementation YYViewController

 

- (void)viewDidLoad
{
    [super viewDidLoad];

    
    // 1.生成一张以后用于平铺的小图片
    CGSize size = CGSizeMake(self.view.frame.size.width, 26);
    UIGraphicsBeginImageContextWithOptions(size , NO, 0);
    
    // 2.画矩形
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    CGFloat height = 26;
    CGContextAddRect(ctx, CGRectMake(0, 0, self.view.frame.size.width, height));
    [[UIColor brownColor] set];
    CGContextFillPath(ctx);
    
    // 3.画线条
    
    CGFloat lineWidth = 2;
    CGFloat lineY = height - lineWidth;
    CGFloat lineX = 0;
    CGContextMoveToPoint(ctx, lineX, lineY);
    CGContextAddLineToPoint(ctx, 320, lineY);
    [[UIColor blackColor] set];
    CGContextStrokePath(ctx);
    
    
    UIImage *image=UIGraphicsGetImageFromCurrentImageContext();
    UIColor *color=[UIColor colorWithPatternImage:image];
    //self.view.backgroundColor=color;
    self.textview.backgroundColor=color;
}

- (IBAction)perBtnClick:(UIButton *)sender {
    self.index--;
    self.textview.text=[NSString stringWithFormat:@"第%d页",self.index];