UIImageView加载网络图片，NSOperationQuene异步加载图片

1. #import "newDetailViewController.h"  
2. #import "Common.h"  
3. #import "newObject.h"  
4. #import "NetRequest.h"  
5. #import <UIKit/UIKitDefines.h>  
6.   
7.   
8. @interface newDetailViewController ()<UIWebViewDelegate>  
9. {  
10.     UILabel *GWDetailTitleText;  
11.     UILabel *GWDetailTitleText1;  
12.     UITextView *GWDetailContentText;  
13.       
14.     UIImageView *imageview;  
15.     NSURL *url;  
16.       
17.     UIView *opaqueview;  
18.     UIActivityIndicatorView *activityIndicator;  
19.       
20. }  
21. @end  
22.   
23. @implementation newDetailViewController  
24.   
25. - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil  
26. {  
27.     self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];  
28.     if (self) {  
29.         if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7) {  
30.             self.view.bounds = CGRectMake(0, -20, self.view.frame.size.width, self.view.frame.size.height );  
31.         }  
32.     }  
33.     return self;  
34. }  
35.   
36. - (void)viewDidLoad  
37. {  
38.       
39.      [UIApplication sharedApplication].statusBarHidden = YES;  
40.     [super viewDidLoad];  
41.     //[self initView];  
42. }  
43.   
44. -(void)initView  
45. {  
46.       
47.     UIButton *loginButton = [[UIButton alloc]initWithFrame:CGRectMake(SCREEN_WIDTH - 40, 0, 40, 30)];  
48.     [loginButton setTitle:@"返回" forState:UIControlStateNormal];  
49.     loginButton.titleLabel.textColor =[UIColor blackColor];  
50.     [loginButton addTarget:self action:@selector(backtofather) forControlEvents:UIControlEventTouchUpInside];  
51.     [self.view addSubview:loginButton];  
52.       
53.     GWDetailTitleText = [[UILabel alloc]initWithFrame:CGRectMake(10, 30, SCREEN_WIDTH - 20, 40)];  
54.     GWDetailTitleText.textAlignment = NSTextAlignmentCenter;  
55.     GWDetailTitleText.numberOfLines = 0;  
56.     GWDetailTitleText.lineBreakMode = UILineBreakModeCharacterWrap;  
57.     [self.view addSubview:GWDetailTitleText];  
58.       
59.       
60.       
61.     GWDetailTitleText1 = [[UILabel alloc]initWithFrame:CGRectMake(10, 70, SCREEN_WIDTH - 20, 20)];  
62.     GWDetailTitleText1.textAlignment = NSTextAlignmentLeft;  
63.     [self.view addSubview:GWDetailTitleText1];  
64.   
65.       
66.       
67.     web = [[UIWebView alloc]initWithFrame:CGRectMake(10, 100, SCREEN_WIDTH - 20, self.view.bounds.origin.y + self.view.bounds.size.height - 110)];  
68.     web.scalesPageToFit = YES;  
69.     web.delegate = self;  
70.     [[web layer] setCornerRadius:10];  
71.     [web setClipsToBounds:YES];  
72.     web.scalesPageToFit = NO;  
73.     for (id subview in web.subviews)  
74.     {  
75.         if ([[subview class] isSubclassOfClass: [UIScrollView class]])  
76.         {  
77.             ((UIScrollView *)subview).bounces = NO;  
78.         }  
79.     }  
80.     web.backgroundColor = [UIColor whiteColor];  
81.     [self.view addSubview:web];  
82.   
83.       
84.       
85.       
86. //    GWDetailContentText = [[UITextView alloc]initWithFrame:CGRectMake(10, 100, SCREEN_WIDTH - 20, self.view.bounds.origin.y + self.view.bounds.size.height - 110)];  
87. //    GWDetailContentText.layer.borderWidth = 1;  
88. //    GWDetailContentText.editable = NO;  
89. //    [self.view addSubview:GWDetailContentText];  
90.   
91.   
92. }  
93.   
94.   
95. -(void)setchoicedDate:(newObject *)myarray  
96. {  
97.     [self initView];  
98.      MyLog(@"%@  ", myarray );  
99.     //MyLog(@"%@", myarray[0]);//[@"rel_title"]  
100.     GWDetailTitleText.text = myarray.rel_title;  
101.       
102.     NSString *date =[[NSString alloc]initWithString:myarray.rel_date];  
103.     date = [date substringToIndex:10];  
104.     NSString *mystring = [NSString stringWithFormat:@"发布人:%@ 日期:%@",myarray.rel_user,date];  
105.     GWDetailTitleText1.text = mystring;  
106.     MyLog(@"%@",myarray.rel_picpath);  
107.     if (![myarray.rel_picpath isEqualToString:@"null"]) {  
108.         url = [NSURL URLWithString:[NSString stringWithFormat:@"%@%@",@"http://www.xf0573.com",myarray.rel_picpath]];  
109.         imageview = [[UIImageView alloc]initWithFrame:CGRectMake(80, 0, 160, 120)];  
110.         imageview.layer.masksToBounds = YES;  
111.         imageview.layer.cornerRadius = 5.0f;  
112.         [imageview setBackgroundColor:[UIColor grayColor]];  
113.         imageview.image = [UIImage imageNamed:@"moren.png"];  
114.         [web addSubview:imageview];  
115.           
116.         opaqueview = [[ UIView   alloc]  initWithFrame: CGRectMake(0, 0,  160, 120)];  
117.         activityIndicator  = [[UIActivityIndicatorView   alloc]  initWithFrame: CGRectMake( 0, 0,  160, 120)];  
118.         [ opaqueview setBackgroundColor:[UIColor blackColor]];  
119.         [ opaqueview setAlpha:0.6 ];  
120.         [ imageview addSubview: opaqueview];  
121.         [ opaqueview addSubview: activityIndicator];  
122.         [ activityIndicator startAnimating ];  
123.         opaqueview.hidden  = NO ;  
124.           
125.         web1 = [[UIWebView alloc]initWithFrame:CGRectMake(10, 120, SCREEN_WIDTH - 20, self.view.bounds.origin.y + self.view.bounds.size.height - web.frame.origin.y - 130)];  
126.         web1.scalesPageToFit = YES;  
127.         web1.delegate = self;  
128.         [[web1 layer] setCornerRadius:10];  
129.         [web1 setClipsToBounds:YES];  
130.         web1.scalesPageToFit = NO;  
131.         for (id subview in web1.subviews)  
132.         {  
133.             if ([[subview class] isSubclassOfClass: [UIScrollView class]])  
134.             {  
135.                 ((UIScrollView *)subview).bounces = NO;  
136.             }  
137.         }  
138.         web1.backgroundColor = [UIColor whiteColor];  
139.         [web1 loadHTMLString:myarray.rel_content baseURL:nil];  
140.         [web addSubview:web1];  
141.           
142.           
143.         NSOperationQueue *operationQueue = [[NSOperationQueue alloc] init];  
144.         NSInvocationOperation *op = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(downloadImage) object:nil];  
145.         [operationQueue addOperation:op];  
146.           
147.           
148.           
149.         //[web loadRequest:req];  
150.     }else if ([myarray.rel_picpath isEqualToString:@"null"])  
151.     {  
152.       
153.     [web loadHTMLString:myarray.rel_content baseURL:nil];  
154.     //GWDetailContentText.text = myarray.rel_content;  
155.     }  
156.   
157. }  
158. - (void)downloadImage  
159. {  
160.       
161.     UIImage *image = [UIImage imageWithData:[NSData dataWithContentsOfURL:url]];  
162.     imageview.image = image;  
163.       
164.     [activityIndicator stopAnimating];  
165.     opaqueview.hidden  = YES ;  
166. }  
167.   
168. -(void)backtofather  
169. {  
170.     [self dismissModalViewControllerAnimated:YES];  
171. }  
172. @end