关于iOS“;“监测”;NSUserDefaults读取和写入
在我的iOS项目中,我使用的是第三方库(Google VR),它可以将内容读写到关于iOS“;“监测”;NSUserDefaults读取和写入,ios,nsuserdefaults,Ios,Nsuserdefaults,在我的iOS项目中,我使用的是第三方库(Google VR),它可以将内容读写到NSUserDefaults 我知道我可以阅读和打印所有用户默认设置(通过类似 NSArray *keys = [[[NSUserDefaults standardUserDefaults] dictionaryRepresentation] allKeys]; for(NSString* key in keys){ // your code here NSLog(@"value: %@ forKe
NSUserDefaults
我知道我可以阅读和打印所有用户默认设置(通过类似
NSArray *keys = [[[NSUserDefaults standardUserDefaults] dictionaryRepresentation] allKeys];
for(NSString* key in keys){
// your code here
NSLog(@"value: %@ forKey: %@",[[NSUserDefaults standardUserDefaults] valueForKey:key],key);
}
我需要的是看看图书馆在找什么而没有找到。基本上,库通过检查userdefaults键来检查它之前是否进行过配置(与硬纸板耳机配对)。我想知道它何时发生以及是什么 我知道其中一种方法是进行区分,打印配对前后的所有用户默认值,并查看更改的内容,但我想知道是否有一种通用方法来监视
NSUserDefaults
read调用
方法swizzling,听起来像是一个可能的解决方案,但我不太确定这将如何工作
编辑:为了记录,我使用了下面@BlackM的答案,发现Google VR for Unity在iOS上查找
com.Google.cardbard.sdk.DeviceParamsAndTime
来检查它是否配置了耳机。我通过方法swizzling实现了它:
#import <objc/runtime.h>
@implementation NSUserDefaults (Read)
+(void)load {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
Class class = [self class];
//Swizzling objectForKey
SEL originalSelectorVWA = @selector(objectForKey:);
SEL swizzledSelectorVWA = @selector(swizzled_objectForKey:);
Method originalMethodVWA = class_getInstanceMethod(class, originalSelectorVWA);
Method swizzledMethodVWA = class_getInstanceMethod(class, swizzledSelectorVWA);
BOOL didAddMethodVWA =
class_addMethod(class,
originalSelectorVWA,
method_getImplementation(swizzledMethodVWA),
method_getTypeEncoding(swizzledMethodVWA));
if (didAddMethodVWA) {
class_replaceMethod(class,
swizzledSelectorVWA,
method_getImplementation(originalMethodVWA),
method_getTypeEncoding(originalMethodVWA));
} else {
method_exchangeImplementations(originalMethodVWA, swizzledMethodVWA);
}
});
}
#pragma mark - Method Swizzling
- (id)swizzled_objectForKey:(NSString *)defaultName {
id data = [self swizzled_objectForKey:defaultName];
if (!data) {
NSDictionary *infoDict = [NSDictionary dictionaryWithObject:defaultName forKey:@"key"];
[[NSNotificationCenter defaultCenter] postNotificationName:@"readNSUserDefaults" object:nil userInfo:infoDict];
}
return data;
}
@end
上面的注释在编辑之前,现在可用于读取。@rmaddy在此最新更改之前是正确的。
- (void)viewDidLoad {
[super viewDidLoad];
NSString *valueToSave = @"someValue";
[[NSUserDefaults standardUserDefaults] setObject:valueToSave forKey:@"someKey"];
[[NSUserDefaults standardUserDefaults] synchronize];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(readNSUSerDefaults:) name:@"readNSUserDefaults" object:nil];
[[NSUserDefaults standardUserDefaults] stringForKey:@"someKey"];
[[NSUserDefaults standardUserDefaults] stringForKey:@"thisKeyDoesntExistKey"];
}
-(void)readNSUSerDefaults:(NSNotification*)notification {
NSString *key = [notification.userInfo objectForKey:@"key"];
NSLog(@"Read key %@ returned nil NSUserDefaults",key);
}