https://blog.csdn.net/daiyelang/article/details/18726947
#pragma mark 数组排序1
voidarraySort1() {
NSArray*array = [NSArrayarrayWithObjects:@"2",@"3",@"1",@"4",nil];
// 返回一个排好序的数组，原来数组的元素顺序不会改变
// 指定元素的比较方法：compare:
NSArray*array2 = [array sortedArrayUsingSelector:@selector(compare:)];
NSLog(@"array2:%@", array2);
}
#pragma mark 数组排序2
voidarraySort2() {
Student *stu1 = [Student studentWithFirstname:@"MingJie"lastname:@"Li"];
Student *stu2 = [Student studentWithFirstname:@"LongHu"lastname:@"Huang"];
Student *stu3 = [Student studentWithFirstname:@"LianJie"lastname:@"Li"];
Student *stu4 = [Student studentWithFirstname:@"Jian"lastname:@"Xiao"];
NSArray*array = [NSArrayarrayWithObjects:stu1,stu2,stu3, stu4,nil];
// 指定排序的比较方法
NSArray*array2 = [array sortedArrayUsingSelector:@selector(compareStudent:)];
NSLog(@"array2:%@", array2);
}
- (NSComparisonResult)compareStudent:(Student *)stu {
// 先按照姓排序
NSComparisonResultresult = [self.lastname compare:stu.lastname];
// 如果有相同的姓，就比较名字
if(result ==NSOrderedSame) {
result = [self.firstname compare:stu.firstname];
? ? }
returnresult;
}
#pragma mark 数组排序3
voidarraySort3() {
Student *stu1 = [Student studentWithFirstname:@"MingJie"lastname:@"Li"];
Student *stu2 = [Student studentWithFirstname:@"LongHu"lastname:@"Huang"];
Student *stu3 = [Student studentWithFirstname:@"LianJie"lastname:@"Li"];
Student *stu4 = [Student studentWithFirstname:@"Jian"lastname:@"Xiao"];
NSArray*array = [NSArrayarrayWithObjects:stu1,stu2,stu3, stu4,nil];
// 利用block进行排序
NSArray*array2 = [array sortedArrayUsingComparator:
^NSComparisonResult(Student *obj1, Student *obj2) {
// 先按照姓排序
NSComparisonResultresult = [obj1.lastname compare:obj2.lastname];
// 如果有相同的姓，就比较名字
if(result ==NSOrderedSame) {
? ? ? ? ? ? result = [obj1.firstname compare:obj2.firstname];
? ? ? ? }
returnresult;
? ? }];
NSLog(@"array2:%@", array2);
}
#pragma mark 数组排序4-高级排序
voidarraySort4() {
Student *stu1 = [Student studentWithFirstname:@"MingJie"lastname:@"Li"bookName:@"book1"];
Student *stu2 = [Student studentWithFirstname:@"LongHu"lastname:@"Huang"bookName:@"book2"];
Student *stu3 = [Student studentWithFirstname:@"LianJie"lastname:@"Li"bookName:@"book2"];
Student *stu4 = [Student studentWithFirstname:@"Jian"lastname:@"Xiao"bookName:@"book1"];
NSArray*array = [NSArrayarrayWithObjects:stu1,stu2,stu3, stu4,nil];
// 1.先按照书名进行排序
// 这里的key写的是@property的名称
NSSortDescriptor*bookNameDesc = [NSSortDescriptorsortDescriptorWithKey:@"book.name"ascending:YES];
// 2.再按照姓进行排序
NSSortDescriptor*lastnameDesc = [NSSortDescriptorsortDescriptorWithKey:@"lastname"ascending:YES];
// 3.再按照名进行排序
NSSortDescriptor*firstnameDesc = [NSSortDescriptorsortDescriptorWithKey:@"firstname"ascending:YES];
// 按顺序添加排序描述器
NSArray*descs = [NSArrayarrayWithObjects:bookNameDesc, lastnameDesc, firstnameDesc,nil];
NSArray*array2 = [array sortedArrayUsingDescriptors:descs];
NSLog(@"array2:%@", array2);
}
