如何检查用户的ios设备上是否安装了某些app？

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1. 使用canOpenURL判断

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

此方法需要定义URLSchemes

2. UIDevice Category For Processes

// .h@interface UIDevice (ProcessesAdditions)- (NSArray *)runningProcesses;@end// .m#import <sys/sysctl.h>@implementation UIDevice (ProcessesAdditions)- (NSArray *)runningProcesses {        int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_ALL, 0};        size_t miblen = 4;                size_t size;        int st = sysctl(mib, miblen, NULL, &size, NULL, 0);                struct kinfo_proc * process = NULL;        struct kinfo_proc * newprocess = NULL;            do {                        size += size / 10;        newprocess = realloc(process, size);                        if (!newprocess){                                    if (process){                free(process);            }                                    return nil;        }                        process = newprocess;        st = sysctl(mib, miblen, process, &size, NULL, 0);                    } while (st == -1 && errno == ENOMEM);                if (st == 0){                                if (size % sizeof(struct kinfo_proc) == 0){                        int nprocess = size / sizeof(struct kinfo_proc);                                        if (nprocess){                                                        NSMutableArray * array = [[NSMutableArray alloc] init];                                        for (int i = nprocess - 1; i >= 0; i--){                                                        NSString * processID = [[NSString alloc] initWithFormat:@"%d", process[i].kp_proc.p_pid];                                        NSString * processName = [[NSString alloc] initWithFormat:@"%s", process[i].kp_proc.p_comm];                                                        NSDictionary * dict = [[NSDictionary alloc] initWithObjects:[NSArray arrayWithObjects:processID, processName, nil]                                                                                                                                                 forKeys:[NSArray arrayWithObjects:@"ProcessID", @"ProcessName", nil]];                                        [processID release];                                        [processName release];                                        [array addObject:dict];                                        [dict release];                                }                                        free(process);                                return [array autorelease];                        }                }        }                return nil;}@end// Example usage.NSArray * processes = [[UIDevice currentDevice] runningProcesses];for (NSDictionary * dict in processes){        NSLog(@"%@ - %@", [dict objectForKey:@"ProcessID"], [dict objectForKey:@"ProcessName"]);}