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NSTimer+Pausing.h

Ios´úÂë

1. #import <Foundation/Foundation.h>
3. @interface NSTimer (Pausing)
5. - (NSMutableDictionary *)pauseDictionary;
6. - (void)pause;
7. - (void)resume;
9. @end

NSTimer+Pausing.m

Ios´úÂë

1. #import "NSTimer+Pausing.h"
3. NSString *kIsPausedKey = @"IsPaused Key";
4. NSString *kRemainingTimeIntervalKey = @"RemainingTimeInterval Key";
6. @implementation NSTimer (Pausing)
8. - (NSMutableDictionary *)pauseDictionary {
9. static NSMutableDictionary *globalDictionary = nil;
11. if(!globalDictionary)
12. globalDictionary = [[NSMutableDictionary alloc] init];
14. if(![globalDictionary objectForKey:[NSNumber numberWithInt:(int)self]]) {
15. NSMutableDictionary *localDictionary = [[[NSMutableDictionary alloc] init] autorelease];
16. [globalDictionary setObject:localDictionary forKey:[NSNumber numberWithInt:(int)self]];
17. }
19. return [globalDictionary objectForKey:[NSNumber numberWithInt:(int)self]];
20. }
22. - (void)pause {
23. if(![self isValid])
24. return;
26. NSNumber *isPausedNumber = [[self pauseDictionary] objectForKey:kIsPausedKey];
27. if(isPausedNumber && YES == [isPausedNumber boolValue])
28. return;
30. NSDate *now = [NSDate date];
31. NSDate *then = [self fireDate];
32. NSTimeInterval remainingTimeInterval = [then timeIntervalSinceDate:now];
34. [[self pauseDictionary] setObject:[NSNumber numberWithDouble:remainingTimeInterval] forKey:kRemainingTimeIntervalKey];
36. [self setFireDate:[NSDate distantFuture]];
37. [[self pauseDictionary] setObject:[NSNumber numberWithBool:YES] forKey:kIsPausedKey];
38. }
40. - (void)resume {
41. if(![self isValid])
42. return;
44. NSNumber *isPausedNumber = [[self pauseDictionary] objectForKey:kIsPausedKey];
45. if(!isPausedNumber || NO == [isPausedNumber boolValue])
46. return;
48. NSTimeInterval remainingTimeInterval = [[[self pauseDictionary] objectForKey:kRemainingTimeIntervalKey] doubleValue];
50. NSDate *fireDate = [NSDate dateWithTimeIntervalSinceNow:remainingTimeInterval];
52. [self setFireDate:fireDate];
53. [[self pauseDictionary] setObject:[NSNumber numberWithBool:NO] forKey:kIsPausedKey];
54. }
56. @end