#import "NSObject+DSKVO.h"
#import <objc/runtime.h>
@implementation NSObject (DSKVO)

+ (void)load
{
    [self switchMethod];
}

// 交换后的方法
- (void)removeDasen:(NSObject *)observer forKeyPath:(NSString *)keyPath
{
    @try {
        [self removeDasen:observer forKeyPath:keyPath];
    } @catch (NSException *exception) {}
}

+ (void)switchMethod
{
    SEL removeSel = @selector(removeObserver:forKeyPath:);
    SEL myRemoveSel = @selector(removeDasen:forKeyPath:);

    Method systemRemoveMethod = class_getClassMethod([self class],removeSel);
    Method DasenRemoveMethod = class_getClassMethod([self class], myRemoveSel);

    method_exchangeImplementations(systemRemoveMethod, DasenRemoveMethod);
}

@end