參考:http://blog.csdn.net/u010828718/article/details/51202624
1.sortedArrayUsingComparator這個(gè)方法本身就是按遞增的方式排序活合。
2.返回的返回值（NSOrderedAscending 不交換婉弹，NSOrderedSame 不交換捌锭，NSOrderedDescending 交換）蝙寨。
例如：object1 < object2 返回：NSOrderedDescending 則交換（變?yōu)閛bject2业汰，object1），以保證安方法本身升序绕德。返回NSOrderedAscending翔冀，兩者不交換。
NSArray *tMlist = @[@4,@5,@2,@6,@3,@7,@8];
NSArray *tMlist2 = @[@"h4",@"h5",@"h2",@"h6",@"h3",@"h7",@"h8"];
//升序1
NSArray *tArray1_1 = [tMlist sortedArrayUsingComparator:^NSComparisonResult(id _Nonnull obj1, id _Nonnull obj2) {
NSNumber *tNumber1 = (NSNumber *)obj1;
NSNumber *tNumber2 = (NSNumber *)obj2;
if ([tNumber1 integerValue] < [tNumber2 integerValue]) {
return NSOrderedDescending;
}
if ([tNumber1 integerValue] > [tNumber2 integerValue]) {
return NSOrderedAscending;
}
return NSOrderedDescending;
}];
//升序2
NSArray *tArray1_2 = [tMlist2 sortedArrayUsingComparator:^NSComparisonResult(id _Nonnull obj1, id _Nonnull obj2) {
return [obj1 compare:obj2 options:NSNumericSearch];
}];
//降序
NSArray *tArray2 = [tMlist sortedArrayUsingComparator:^NSComparisonResult(id _Nonnull obj1, id _Nonnull obj2) {
NSNumber *tNumber1 = (NSNumber *)obj1;
NSNumber *tNumber2 = (NSNumber *)obj2;
if ([tNumber1 integerValue] < [tNumber2 integerValue]) {
return NSOrderedAscending;
}
if ([tNumber1 integerValue] > [tNumber2 integerValue]) {
return NSOrderedDescending;
}
return NSOrderedDescending;
}];
//倒序
NSArray *tArray3 = [tMlist sortedArrayUsingComparator:^NSComparisonResult(id _Nonnull obj1, id _Nonnull obj2) {
return NSOrderedDescending;
}];
