如何检查用户的ios设备上是否安装了某些app？

1. 使用canOpenURL判断

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1. NSURL *instagramURL = [NSURL URLWithString:@"instagram://location?id=1"];  
2. BOOL hasInstagram = [[UIApplication sharedApplication] canOpenURL:instagramURL];  

此方法需要定义URLSchemes

2. UIDevice Category For Processes

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1. // .h  
2.   
3. @interface UIDevice (ProcessesAdditions)  
4. - (NSArray *)runningProcesses;  
5. @end  
6.   
7. // .m  
8. #import <sys/sysctl.h>  
9.   
10. @implementation UIDevice (ProcessesAdditions)  
11.   
12. - (NSArray *)runningProcesses {  
13.   
14.         int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_ALL, 0};  
15.         size_t miblen = 4;  
16.           
17.         size_t size;  
18.         int st = sysctl(mib, miblen, NULL, &size, NULL, 0);  
19.           
20.         struct kinfo_proc * process = NULL;  
21.         struct kinfo_proc * newprocess = NULL;  
22.           
23.     do {  
24.                   
25.         size += size / 10;  
26.         newprocess = realloc(process, size);  
27.                   
28.         if (!newprocess){  
29.                           
30.             if (process){  
31.                 free(process);  
32.             }  
33.                           
34.             return nil;  
35.         }  
36.                   
37.         process = newprocess;  
38.         st = sysctl(mib, miblen, process, &size, NULL, 0);  
39.                   
40.     } while (st == -1 && errno == ENOMEM);  
41.           
42.         if (st == 0){  
43.                   
44.                 if (size % sizeof(struct kinfo_proc) == 0){  
45.                         int nprocess = size / sizeof(struct kinfo_proc);  
46.                   
47.                         if (nprocess){  
48.                           
49.                                 NSMutableArray * array = [[NSMutableArray alloc] init];  
50.           
51.                                 for (int i = nprocess - 1; i >= 0; i--){  
52.                   
53.                                         NSString * processID = [[NSString alloc] initWithFormat:@"%d", process[i].kp_proc.p_pid];  
54.                                         NSString * processName = [[NSString alloc] initWithFormat:@"%s", process[i].kp_proc.p_comm];  
55.                   
56.                                         NSDictionary * dict = [[NSDictionary alloc] initWithObjects:[NSArray arrayWithObjects:processID, processName, nil]   
57.                                                                                                                                                 forKeys:[NSArray arrayWithObjects:@"ProcessID", @"ProcessName", nil]];  
58.                                         [processID release];  
59.                                         [processName release];  
60.                                         [array addObject:dict];  
61.                                         [dict release];  
62.                                 }  
63.           
64.                                 free(process);  
65.                                 return [array autorelease];  
66.                         }  
67.                 }  
68.         }  
69.           
70.         return nil;  
71. }  
72.   
73. @end  
74.   
75. // Example usage.  
76. NSArray * processes = [[UIDevice currentDevice] runningProcesses];  
77. for (NSDictionary * dict in processes){  
78.         NSLog(@"%@ - %@", [dict objectForKey:@"ProcessID"], [dict objectForKey:@"ProcessName"]);  
79. }