由于最近在做App內(nèi)購(gòu)贼涩，需要保證支付安全顾瞻，對(duì)于已越獄的iOS 設(shè)備全部不允許內(nèi)購(gòu)行為宿接，簡(jiǎn)單粗暴有效焦匈，可以通過(guò)下面工具的方法判斷iOS設(shè)備是否越獄血公。

.h 文件
#import <Foundation/Foundation.h>
@interface JailbreakDetectTool : NSObject
/**
 * 檢查當(dāng)前設(shè)備是否已經(jīng)越獄。
 */
+ (BOOL)detectCurrentDeviceIsJailbroken;
@end
.m 文件
#import "JailbreakDetectTool.h"
#define ARRAY_SIZE(a) sizeof(a)/sizeof(a[0])
@implementation JailbreakDetectTool
// 四種檢查是否越獄的方法, 只要命中一個(gè), 就說(shuō)明已經(jīng)越獄.
+ (BOOL)detectCurrentDeviceIsJailbroken {
    BOOL result =  NO;
    
    result = [self detectJailBreakByJailBreakFileExisted];
    
    if (!result) {
        result = [self detectJailBreakByAppPathExisted];
    }
    
    if (!result) {
        result = [self detectJailBreakByEnvironmentExisted];
    }
    
    if (!result) {
        result = [self detectJailBreakByCydiaPathExisted];
    }
    
    return result;
}
/**
 * 判定常見的越獄文件
 * /Applications/Cydia.app
 * /Library/MobileSubstrate/MobileSubstrate.dylib
 * /bin/bash
 * /usr/sbin/sshd
 * /etc/apt
 * 這個(gè)表可以盡可能的列出來(lái)缓熟，然后判定是否存在累魔，只要有存在的就可以認(rèn)為機(jī)器是越獄了。
 */
const char* jailbreak_tool_pathes[] = {
    "/Applications/Cydia.app",
    "/Library/MobileSubstrate/MobileSubstrate.dylib",
    "/bin/bash",
    "/usr/sbin/sshd",
    "/etc/apt"
};
+ (BOOL)detectJailBreakByJailBreakFileExisted {
    for (int i = 0; i<ARRAY_SIZE(jailbreak_tool_pathes); i++) {
        if ([[NSFileManager defaultManager] fileExistsAtPath:[NSString stringWithUTF8String:jailbreak_tool_pathes[i]]]) {
            NSLog(@"The device is jail broken!");
            return YES;
        }
    }
    NSLog(@"The device is NOT jail broken!");
    return NO;
}
/**
 * 判斷cydia的URL scheme.
 */
+ (BOOL)detectJailBreakByCydiaPathExisted {
    if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"cydia://"]]) {
        NSLog(@"The device is jail broken!");
        return YES;
    }
    NSLog(@"The device is NOT jail broken!");
    return NO;
}
/**
 * 讀取系統(tǒng)所有應(yīng)用的名稱.
 * 這個(gè)是利用不越獄的機(jī)器沒有這個(gè)權(quán)限來(lái)判定的够滑。
 */
#define USER_APP_PATH                 @"/User/Applications/"
+ (BOOL)detectJailBreakByAppPathExisted {
    if ([[NSFileManager defaultManager] fileExistsAtPath:USER_APP_PATH]) {
        NSLog(@"The device is jail broken!");
        NSArray *applist = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:USER_APP_PATH error:nil];
        NSLog(@"applist = %@", applist);
        return YES;
    }
    NSLog(@"The device is NOT jail broken!");
    return NO;
}
/**
 * 這個(gè)DYLD_INSERT_LIBRARIES環(huán)境變量垦写，在非越獄的機(jī)器上應(yīng)該是空，越獄的機(jī)器上基本都會(huì)有Library/MobileSubstrate/MobileSubstrate.dylib.
 */
char* printEnv(void) {
    char *env = getenv("DYLD_INSERT_LIBRARIES");
    return env;
}
+ (BOOL)detectJailBreakByEnvironmentExisted {
    if (printEnv()) {
        NSLog(@"The device is jail broken!");
        return YES;
    }
    NSLog(@"The device is NOT jail broken!");
    return NO;
}
@end