iOS开发——图形编程OC篇&（六）Quartz 2D高级使用（二）

 1 //
 2 //  YYview.m
 3 //  06-四边形的五种画法
 4 //
 5 //  Created by apple on 14-6-11.
 6 //  Copyright (c) 2014年 itcase. All rights reserved.
 7 //
 8 
 9 #import "YYview.h"
10 
11 @implementation YYview
12 
13 
14 - (void)drawRect:(CGRect)rect
15 {
16     //获取图形上下文
17     CGContextRef ctx=UIGraphicsGetCurrentContext();
18     //第一种画法,通过连接固定的点绘制四边形
19 //    CGContextMoveToPoint(ctx, 0, 20);
20 //    CGContextAddLineToPoint(<#CGContextRef c#>, <#CGFloat x#>, <#CGFloat y#>);
21 //    CGContextAddLineToPoint(<#CGContextRef c#>, <#CGFloat x#>, <#CGFloat y#>);
22 //    CGContextAddLineToPoint(<#CGContextRef c#>, <#CGFloat x#>, <#CGFloat y#>);
23     
24     //第二种方式：指定起点和宽高绘制四边形
25 //    CGContextAddRect(ctx, CGRectMake(20, 20, 200, 100));
26 //    //渲染
27 //    CGContextStrokePath(ctx);
28     
29     //第三种方式：二种的两步合并成一步。
30     //画空心的四边形
31 //    CGContextStrokeRect(ctx, CGRectMake(20, 20, 200, 100));
32 //    //画实心的四边形
33 //    CGContextFillRect(ctx, CGRectMake(20, 20, 200, 100));
34     
35     //第四种方式（oc的方法）：绘制实心的四边形，注意没有空心的方法
36     UIRectFill(CGRectMake(20, 20, 200, 100));
37     
38     //第五种方式：画根线，设置线条的宽度（通过这种方式可以画斜的四边形）
39 //    CGContextMoveToPoint(ctx, 20, 20);
40 //    CGContextAddLineToPoint(ctx, 100, 200);
41 //    CGContextSetLineWidth(ctx, 50);
42 //    //注意，线条只能画成是空心的
43 //    CGContextStrokePath(ctx);
44     
45 }
46 @end

 1 #import "YYViewController.h"
 2 
 3 @interface YYViewController ()
 4 
 5 @end
 6 
 7 @implementation YYViewController
 8 
 9 - (void)viewDidLoad
10 {
11     [super viewDidLoad];
12 
13     UIImage *image=[UIImage imageNamed:@"me"];
14     UIColor *color=[UIColor colorWithPatternImage:image];
15     self.view.backgroundColor=color;
16 }
17 
18 @end

 1 //
 2 //  YYViewController.m
 3 //  01-信纸条纹
 4 //
 5 //  Created by 孔医己 on 14-6-11.
 6 //  Copyright (c) 2014年 itcast. All rights reserved.
 7 //
 8 
 9 #import "YYViewController.h"
10 
11 @interface YYViewController ()
12 
13 @property (weak, nonatomic) IBOutlet UITextView *textview;
14 - (IBAction)perBtnClick:(UIButton *)sender;
15 - (IBAction)nextBtnClick:(UIButton *)sender;
16 @property(nonatomic,assign)int index;
17 @end
18 
19 @implementation YYViewController
20 
21 - (void)viewDidLoad
22 {
23     [super viewDidLoad];
24 
25     
26     // 1.生成一张以后用于平铺的小图片
27     CGSize size = CGSizeMake(self.view.frame.size.width, 26);
28     UIGraphicsBeginImageContextWithOptions(size , NO, 0);
29     
30     // 2.画矩形
31     CGContextRef ctx = UIGraphicsGetCurrentContext();
32     CGFloat height = 26;
33     CGContextAddRect(ctx, CGRectMake(0, 0, self.view.frame.size.width, height));
34     [[UIColor brownColor] set];
35     CGContextFillPath(ctx);
36     
37     // 3.画线条
38     
39     CGFloat lineWidth = 2;
40     CGFloat lineY = height - lineWidth;
41     CGFloat lineX = 0;
42     CGContextMoveToPoint(ctx, lineX, lineY);
43     CGContextAddLineToPoint(ctx, 320, lineY);
44     [[UIColor blackColor] set];
45     CGContextStrokePath(ctx);
46     
47     
48     UIImage *image=UIGraphicsGetImageFromCurrentImageContext();
49     UIColor *color=[UIColor colorWithPatternImage:image];
50     //self.view.backgroundColor=color;
51     self.textview.backgroundColor=color;
52 }
53 
54 - (IBAction)perBtnClick:(UIButton *)sender {
55     self.index--;
56     self.textview.text=[NSString stringWithFormat:@"第%d页",self.index];
57     CATransition *ca = [[CATransition alloc] init];
58     ca.type = @"pageCurl";
59     
60     [self.textview.layer addAnimation:ca forKey:nil];
61     
62 }
63 
64 - (IBAction)nextBtnClick:(UIButton *)sender {
65     self.index++;
66     self.textview.text=[NSString stringWithFormat:@"第%d页",self.index];
67     CATransition *ca = [[CATransition alloc] init];
68     ca.type = @"pageCurl";
69     
70     [self.textview.layer addAnimation:ca forKey:nil];
71 }
72 @end

 1 //
 2 //  YYViewController.m
 3 //  01-截屏
 4 //
 5 //  Created by apple on 14-6-12.
 6 //  Copyright (c) 2014年 itcase. All rights reserved.
 7 //
 8 
 9 #import "YYViewController.h"
10 #import "MBProgressHUD+NJ.h"
11 
12 @interface YYViewController ()
13 @property (weak, nonatomic) IBOutlet UIView *contentView;
14 - (IBAction)BtnClick:(UIButton *)sender;
15 
16 @end
17 
18 @implementation YYViewController
19 
20 - (void)viewDidLoad
21 {
22     [super viewDidLoad];
23 }
24 
25 - (IBAction)BtnClick:(UIButton *)sender {
26     
27     //延迟两秒保存
28     dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
29         //获取图形上下文
30         //    UIGraphicsBeginImageContext(self.view.frame.size);
31         UIGraphicsBeginImageContext(self.contentView.frame.size);
32         //将view绘制到图形上下文中
33         
34         //    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
35         [self.contentView.layer renderInContext:UIGraphicsGetCurrentContext()];
36      
37         
38         //将截屏保存到相册
39         UIImage *newImage=UIGraphicsGetImageFromCurrentImageContext();
40         
41         UIImageWriteToSavedPhotosAlbum(newImage,self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
42     });
43 }
44 
45  - (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo
46 {
47     if (error) {
48         [MBProgressHUD showError:@"保存失败，请检查是否拥有相关的权限"];
49     }else
50     {
51 //        [MBProgressHUD showMessage:@"保存成功！"];
52         [MBProgressHUD showSuccess:@"保存成功！"];
53     }
54 }
55 
56 @end