iphone - 覆盖 - (BOOL)isEqual :(id)object

Question

我想覆盖这个方法来比较两个对象。

-(BOOL)isEqual:(id)object

调用函数

-(void)overridemethod(

custom class object1 isEqual:  custom class object2

)

函数的定义

let suppose comparing the date parameter of two objects. Then how can i do that.

提前致谢

Answer 1

实现通常采用这种形式:

@interface MONInteger : NSObject
{
@private
    int value;
}

@property (nonatomic, assign, readonly) int value;

@end

@implementation MONInteger
...
- (BOOL)isEqual:(id)object
{
    // MONInteger allows a comparison to NSNumber
    if ([object isKindOfClass:[NSNumber class]]) {
        NSNumber * other = object;
        return self.value == other.intValue;
    }
    else if (![object isKindOfClass:self.class]) {
        return NO;
    }
    MONInteger * other = object;
    return self.value == other.value;
}

@end