STAssertEqualObjects和STAssertEquals有什么区别？

Question

我有以下课程:

#import "Period.h"

@implementation Period

...

- (BOOL)isEqualTo:(id)object {
    return [self isEqual:object];
}

- (BOOL)isEqual:(id)object {

    if (object == self) {
        return YES;
    }

    if ([[object beginDate] hash] == [[self beginDate] hash] &&
        [[object endDate] hash] == [[self endDate] hash]) {
        return YES;
    }

    return NO;
}

...

@end

还有以下测试,使用以下方法编写OCUnit:

Period *period;
NSDate *beginDate;
NSDate *endDate;

- (void)setUp {
    beginDate = [NSDate dateWithString:@"2011-02-25"];
    endDate = [NSDate dateWithString:@"2011-03-25"];

    period = [[Period alloc] initWithBeginDate:beginDate
                                       endDate:endDate];
}

- (void)testEndDateShouldBeGreaterOrEqualThanBeginDate {
    Period *newPeriod = [[Period alloc] initWithBeginDate:beginDate
                                                  endDate:beginDate];

    STAssertEqualObjects(beginDate, [newPeriod beginDate], @"Begin dates are different");
    STAssertEqualObjects(endDate, [newPeriod endDate], @"End dates are different");
}

以前我用的是STAssertEquals代替,STAssertEqualObjects而不是调用isEqual方法Period.

我只想了解两件事:

• 这两种方法有什么区别？
• isEqual和之间有什么区别isEqualTo？

Answer 1

STAssertEquals比较与标量类型(被用来组成传递给它,并打算在两个参数的原始字节float,int,char等),structs或者unions---你不应该用它来比较Objective-C对象.STAssertEqualObjects通过调用比较两个Objective-C对象isEqual:.

isEqualTo:用于支持NSSpecifierTest(请参阅NSComparisonMethods协议参考).isEqualTo:如果您的对象不是可编写脚本的,则不必提供实现.