2017-02-07 16_33_47.gif
通讯录是现在开发一个app必不可少的功能了，因为每个老板都想囤积用户，所以都想搞
IM,虽然这块肉不是人人都能吃，但明显很多人都想分一杯羹，我们作为开发，吃肉喝汤当然轮不到我们o(╯□╰)o，可是分下来的任务必须完成。
既然有通讯录，当然离不开排序
- 排序标记
@protocol SortProtocol <NSObject>
/// 排序标记
- (NSString *)sortPreferredFlag;
@end
-
外部调用接口
/** 分组排序 @param objects 排序对象 @param completion 排序结果 @param empty 是否允许空数组 @param queue 排序线程 */ + (void)sortObjects:(nullable NSArray<SortProtocol> *)objects withCompletion:(void(^)(NSDictionary * _Nullable sortedResult, NSArray * _Nullable sectionTitles))completion withEmptySections:(BOOL)empty withQueue:(nullable dispatch_queue_t)queue; -
内部实现
- 创建一个SortPresenter类
+ (void)sortObjects:(NSArray<SortProtocol> *)objects withCompletion:(void (^)(NSDictionary * _Nullable, NSArray * _Nullable))completion withEmptySections:(BOOL)empty withQueue:(dispatch_queue_t)queue {
if (!objects || objects.count == 0) { // 没有可执行排序数据
dispatch_async(dispatch_get_main_queue(), ^{
completion(nil,nil);
});
} else {
dispatch_queue_t currentQueue = queue ? queue : dispatch_queue_create("sortPresenter.queue", 0);
dispatch_async(currentQueue, ^{
[self invokeSortObjects:objects withEmptySections:empty withCompletion:completion];
});
}
}
+ (void)invokeSortObjects:(NSArray<SortProtocol> *)objects withEmptySections:(BOOL)empty withCompletion:(void (^)(NSDictionary * _Nullable,NSArray * _Nullable))completion {
UILocalizedIndexedCollation *collation = [UILocalizedIndexedCollation currentCollation];
NSInteger sectionTitlesCount = [[collation sectionTitles] count];
NSMutableArray *sectionArray = [[NSMutableArray alloc] initWithCapacity:sectionTitlesCount];
for (NSInteger index = 0; index < sectionTitlesCount; index ++) {
NSMutableArray *section = [[NSMutableArray alloc] init];
[sectionArray addObject:section];
}
for (id<SortProtocol> obj in objects) {
NSInteger sectionIndex = [collation sectionForObject:obj collationStringSelector:@selector(sortPreferredFlag)];
NSMutableArray *section = sectionArray[sectionIndex];
[section addObject:obj];
}
NSMutableDictionary *resultDictionary = [NSMutableDictionary dictionaryWithCapacity:10];
for (NSInteger index = 0; index < sectionArray.count; index ++) {
NSMutableArray *section = sectionArray[index];
NSArray *sortedSection = [collation sortedArrayFromArray:section collationStringSelector:@selector(sortPreferredFlag)];
sectionArray[index] = sortedSection;
}
if (empty) {
for (int index = 0; index < sectionArray.count && collation.sectionTitles.count; index ++) {
[resultDictionary setObject:sectionArray[index] forKey:collation.sectionTitles[index]];
}
dispatch_async(dispatch_get_main_queue(), ^{
completion(resultDictionary, collation.sectionTitles);
});
} else {
NSMutableArray *fitterSectionArray = [NSMutableArray arrayWithCapacity:0];
NSMutableArray *fitterSectionTitles = [NSMutableArray arrayWithCapacity:0];
for (int index = 0; index < sectionArray.count && collation.sectionTitles.count; index ++) {
if ([sectionArray[index] count] != 0) {
[fitterSectionArray addObject:sectionArray[index]];
[resultDictionary setObject:sectionArray[index] forKey:collation.sectionTitles[index]];
[fitterSectionTitles addObject:collation.sectionTitles[index]];
}
}
dispatch_async(dispatch_get_main_queue(), ^{
completion(resultDictionary, fitterSectionTitles);
});
}
}
调用只需要一句代码：
[SortPresenter sortObjects:contacts
withCompletion:^(NSDictionary * _Nullable sortedResult, NSArray * _Nullable sectionTitles) {
self.dataSource = sortedResult.mutableCopy;
self.sectionTitles = sectionTitles.mutableCopy;
[self.tableView reloadData];
} withEmptySections:NO withQueue:nil];
看看控制台打印：
sortResult->>>>>>{
A = (
"<Contact: 0x60800003b840>"
);
B = (
"<Contact: 0x60800003b860>"
);
C = (
"<Contact: 0x608000227880>"
);
H = (
"<Contact: 0x60800003b580>",
"<Contact: 0x60800003b620>"
);
K = (
"<Contact: 0x60800003b600>"
);
L = (
"<Contact: 0x60800003b640>",
"<Contact: 0x60800003b540>"
);
M = (
"<Contact: 0x608000229980>"
);
X = (
"<Contact: 0x60800003b520>",
"<Contact: 0x60800003b4a0>",
"<Contact: 0x60800003b5a0>"
);
Z = (
"<Contact: 0x60800003b560>"
);
}
喜欢这个排序后的格式，条理清晰，又不会有太多冗余。
这个排序还是比较简单，没有做多音字和同音字处理，以后会完善。
