1 #import "TableViewController.h"
2
3 @interface TableViewController ()
4
5 @end
6
7 @implementation TableViewController
8
9 - (void)viewDidLoad {
10 [super viewDidLoad];
11
12 }
13
14 - (void)didReceiveMemoryWarning {
15 [super didReceiveMemoryWarning];
16 // Dispose of any resources that can be recreated.
17 }
18
19 #pragma mark - Table view data source
20
21 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
22 return 1;
23 }
24
25 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
26 return 100;
27 }
28
29
30 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
31 UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell" forIndexPath:indexPath];
32 //NSThread 线程对象,轻量级的多线程方式
33 //手动创建,手动启动线程
34 NSThread *thread = [[NSThread alloc] initWithTarget:self selector:@selector(loopIn) object:nil];
35 //执行
36 [thread start];
37 //取消,线程启动前可以取消,
38 [thread cancel];
39
40 //自动执行线程
41 // [NSThread detachNewThreadSelector:@selector(loopIn) toTarget:self withObject:nil];
42
43 return cell;
44 }
45 -(void)loopIn{
46
47 //手动创建的子线程须添自动释放池,系统的子线程无需添加
48 @autoreleasepool {
49 //线程休眠(秒)
50 [NSThread sleepForTimeInterval:1];
51
52 //线程状态cancel/finish/excuting
53 //获取当前线程,输出线程状态
54 NSThread *currentThread = [NSThread currentThread];
55 //当前线程是否取消
56 NSLog(@"取消:%d",[currentThread isCancelled]);
57 //当前线程是否结束
58 NSLog(@"结束:%d",[currentThread isFinished]);
59 //当前线程是否执行
60 NSLog(@"执行:%d",[currentThread isExecuting]);
61 for (int i = 0; i < 100; i++) {
62 printf("%d",i);
63 //线程退出,强制退出当前线程
64 [NSThread exit];
65 }
66 }
67 //线程休眠(秒)
68 [NSThread sleepForTimeInterval:1];
69
70 //线程状态cancel/finish/excuting
71 //获取当前线程,输出线程状态
72 NSThread *currentThread = [NSThread currentThread];
73 //当前线程是否取消
74 NSLog(@"取消:%d",[currentThread isCancelled]);
75 //当前线程是否结束
76 NSLog(@"结束:%d",[currentThread isFinished]);
77 //当前线程是否执行
78 NSLog(@"执行:%d",[currentThread isExecuting]);
79 for (int i = 0; i < 100; i++) {
80 printf("%d",i);
81 //线程退出,强制退出当前线程
82 [NSThread exit];
83 }
84
85 }
86
87
88
89 @end
1 #import "ViewController.h"
2
3 @interface ViewController ()
4 @property (weak, nonatomic) IBOutlet UIImageView *imageView;
5
6 @end
7
8 @implementation ViewController
9
10 - (void)viewDidLoad {
11 [super viewDidLoad];
12 // Do any additional setup after loading the view, typically from a nib.
13 }
14 //返回
15 - (IBAction)back:(UIButton *)sender {
16
17 [self dismissViewControllerAnimated:YES completion:nil];
18 //下载
19 }
20 - (IBAction)download:(id)sender {
21 //自动线程
22 [NSThread detachNewThreadSelector:@selector(loadImage) toTarget:self withObject:nil];
23
24
25 }
26 //加载图片
27 -(void)loadImage
28 {
29 NSURL *url = [NSURL URLWithString:@"http://b.hiphotos.baidu.com/zhidao/pic/item/a8ec8a13632762d01650d902a3ec08fa513dc625.jpg"];
30 NSData *imgData = [NSData dataWithContentsOfURL:url];
31
32 UIImage *image = [UIImage imageWithData:imgData];
33 self.imageView.image = image;
34 }
35
36 - (void)didReceiveMemoryWarning {
37 [super didReceiveMemoryWarning];
38 // Dispose of any resources that can be recreated.
39 }
40
41 @end
