苹果私有函数使用初探

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苹果私有函数使用初探

在OSX或者IOS的开发过程中，有时为了解决一些棘手的问题，在没有其他可选方法的情况下，不得不使用苹果的私有函数。当然使用的话，在审核的过程中，肯定会被毙掉的。面对如何尴尬的问题，该如何解决呢。
本文只是介绍一些可能规避的方法，建议不要直接使用显而易见的关键字（比如_NSThemeCloseWidget、_NSThemeZoomWidget等等），可以采用混淆的方法，比如直接使用NSData类型的，用到的时候再通过如下代码转换一下。

NSClassFromString([[NSString alloc] initWithData:myData encoding:NSUTF8StringEncoding])

或者使用字符串的拼接，打乱之前的顺序等等方法，反正确保不要从字面上就可以轻易的看出来。

最后附上对上一篇按钮的Hover状态解决办法的代码：

CFStringRef (* originalIMP)(id self, SEL _cmd);NSMutableData *stateOneData;NSMutableData *stateTwoData;NSMutableData *stateThreeData;-(void)initSwizzingMethod {    NSString * strOne = @"5f4e5354 68656d65 57696467 65744365 6c6c";    NSString *strTwo = @"636f7265 55495374 617465";    NSString *stateOne = @"6e6f726d 616c";    NSString *stateTwo = @"726f6c6c 6f766572";    NSString *stateThree = @"70726573 736564" ;    NSMutableData *dataOne = [[NSMutableData alloc]init];    NSMutableData *dataTwo = [[NSMutableData alloc]init];    stateOneData = [[NSMutableData alloc]init];    stateTwoData = [[NSMutableData alloc]init];    stateThreeData = [[NSMutableData alloc]init];    //@"_NSThemeWidgetCell"    [self convertFunctionDataFromString:strOne result:dataOne];    //@"coreUIState"    [self convertFunctionDataFromString:strTwo result:dataTwo];    //@"pressed"    [self convertFunctionDataFromString:stateOne result:stateOneData];    //@"rollover"    [self convertFunctionDataFromString:stateTwo result:stateTwoData];    //@"normal"    [self convertFunctionDataFromString:stateThree result:stateThreeData];    Method stateMethod = class_getInstanceMethod(                                                 NSClassFromString([[NSString alloc]initWithData:dataOne encoding:NSUTF8StringEncoding]),                                                 NSSelectorFromString([[NSString alloc]initWithData:dataTwo encoding:NSUTF8StringEncoding]));    const char *encoding = method_getTypeEncoding(stateMethod);    originalIMP = (void*)method_getImplementation(stateMethod);    class_replaceMethod(                        NSClassFromString([[NSString alloc]initWithData:dataOne encoding:NSUTF8StringEncoding]),                        NSSelectorFromString([[NSString alloc]initWithData:dataTwo encoding:NSUTF8StringEncoding]),                        (IMP)methodState,                        encoding);}static CFStringRef methodState(id self, SEL _cmd) {    if ([self isKindOfClass:[NSButtonCell class]]) {        NSButtonCell *cell = (NSButtonCell*)self;        NSString *title = [cell title];        if ([title isEqualToString:@"CUSTOM_BUTTON"]) {            if (cell.highlighted) {                return (__bridge_retained CFStringRef)([[NSString alloc]initWithData:stateThreeData encoding:NSUTF8StringEncoding]);            } else if (cell.state) {                return (__bridge_retained CFStringRef)([[NSString alloc]initWithData:stateTwoData encoding:NSUTF8StringEncoding]);            } else {                return (__bridge_retained  CFStringRef)([[NSString alloc]initWithData:stateOneData encoding:NSUTF8StringEncoding]);            }        }    }    return originalIMP(self,_cmd);}//以下几个函数用于转换-(NSData*)converData:(NSString*)str {    unsigned int value;    NSScanner *scanner = [NSScanner scannerWithString:str];    [scanner scanHexInt:&value];    NSString *convertStr = [NSString stringWithFormat:@"%c",value];    NSData *data = [convertStr dataUsingEncoding:NSUTF8StringEncoding];    return data;}-(void)convertDataFromString:(NSString*)str                   resultData:(NSMutableData*)resultData {    if (str.length <= 2) {        NSData *data = [self converData:str];        [resultData appendData:data];        return;    }    NSString *str1 = [str substringWithRange:NSMakeRange(0, 2)];    [self  convertDataFromString:str1                      resultData:resultData];    NSString *str2 = [str substringFromIndex:2];    [self  convertDataFromString:str2                      resultData:resultData];}-(void)convertFunctionDataFromString:(NSString*)str                               result:(NSMutableData*)data {    [str enumerateSubstringsInRange:(NSMakeRange(0, str.length))                            options:NSStringEnumerationByWords                         usingBlock:^(NSString *substring,                                      NSRange substringRange,                                      NSRange enclosingRange,                                      BOOL *stop) {                             [self convertDataFromString:substring                                              resultData:data];                         }];}

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