开源类库之三（MPProgressHUD）

MPProgressHUD是一个非常好用的进度指示器类库，其提供了苹果官方sdk没有提供的progress indicator接口，且提供多种样式，使用方法简便。

首先将类库文件添加到项目中。

使用实例代码如下：

[cpp] view
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1. #import <UIKit/UIKit.h>
2. #import "MBProgressHUD.h"

[cpp] view
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1. #import <libkern/OSAtomic.h>
2. @interface SampleViewController : UITableViewController <MBProgressHUDDelegate>
3. @property (nonatomic, retain) NSCondition* condition;
4. @property (nonatomic, retain) MBProgressHUD* hud;
5. @end
6. static volatile NSInteger WAITING_RESPONSE_FOR_SERVERRESPONSE = 0;
7. - (void) popOutMBProgressHUD;
8. - (void) selectorForMPProgressHUD;
9. - (void) notifyMPProgressHUDToDisappear;
10. @implementation SampleViewController
11. @synthesize hud = _hud;
12. @synthesize condition = _condition;
13. - (id) initWithCoder:(NSCoder *)aDecoder
14. {
15. self = [super initWithCoder: aDecoder];
16. if (self != nil) {
17. _hud = nil;
18. _condition = [[NSCondition alloc] init];
19. }
20. return self;
21. }
22. - (void) dealloc
23. {
24. [_hud release];
25. [_condition release];
26. }
27. - (void) popOutMBProgressHUD
28. {
29. MBProgressHUD* tempHud = [[MBProgressHUD alloc] initWithView:self.navigationController.view];
30. self.hud = tempHud;
31. [self.navigationController.view addSubview: tempHud];
32. self.hud.dimBackground = YES;
33. self.hud.delegate = self;
34. self.hud.labelText = @"正在处理";
35. [self.hud showWhileExecuting:@selector(selectorForMPProgressHUD) onTarget:self withObject: nil animated:YES];
36. [tempHud release];
37. }
38. - (void) selectorForMPProgressHUD
39. {
40. OSAtomicCompareAndSwapInt(0,
41. 1,
42. &WAITING_RESPONSE_FOR_SERVERRESPONSE);
43. [self performSelectorInBackground: @selector(tempSelector) withObject: nil];
44. [self.condition lock];
45. while (OSAtomicCompareAndSwapInt(1,
46. 1,
47. &WAITING_RESPONSE_FOR_SERVERRESPONSE)) {
48. NSDate* timeOutDate = [NSDate dateWithTimeIntervalSinceNow: 5.0f];
49. [self.condition waitUntilDate: timeOutDate];
50. }
51. [self.condition unlock];
52. }
53. - (void) notifyMPProgressHUDToDisappear
54. {
55. //通知进度显示hud消失
56. [self.condition lock];
57. OSAtomicCompareAndSwapInt(1,
58. 0,
59. &WAITING_RESPONSE_FOR_SERVERRESPONSE);
60. [self.condition signal];
61. [self.condition unlock];
62. }

[cpp] view
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1. - (void)hudWasHidden:(MBProgressHUD *)hud
2. {
3. // Remove HUD from screen when the HUD was hidded
4. [self.hud removeFromSuperview];
5. self.hud = nil;
6. }
7. - (void) tempSelector
8. {
9. sleep(3.0f);//模拟真实的耗时操作
10. [self notifyMPProgressHUDToDisappear];
11. }
12. @end