动态效果
前两天有个朋友问我微信中的通讯录界面怎么实现的,然后写了个Demo给他参考,整理了下，主要难点在于:中文,英文,特殊符号,表情混合排序,其次就是搜索功能，这里索引里面还得有搜索符号。如果你在使用时因为
translucent属性遇到了问题，请参考我后面写的另外一篇文章使用UISearchController时 navigationBar translucent 属性导致的问题总结
难点剖析
- 获取中文首字母
-(NSString *)chineseStringFirstCharactor
{
NSAssert(self.length>0, @"chineseStringFirstCharactor String can not is nil");
//转成可变字符串
NSMutableString *str = [[NSMutableString alloc]initWithString:self];
//先转换为带声调的拼音
CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformToLatin, NO);
//再转换为不带声调的拼音
CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformStripDiacritics, NO);
//转化为大写拼音
NSString *pinString = [str capitalizedString];
//获取并返回首字母
return [[pinString substringToIndex:1]uppercaseString];
}
- 字符串中文开头判断
-(BOOL)isChineseCharacterBegin
{
NSAssert(self.length>0, @"isChineseCharacterBegin String can not is nil");
int a = [self characterAtIndex:0];
if( a > 0x4e00 && a < 0x9fff)
return YES;
else
return NO;
}
- 英文字母开头判断
-(BOOL)isLettersBegin
{
NSAssert(self.length>0, @"isLettersBegin String can not is nil");
NSString *regex = @"[A-Za-z]+";
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
NSString *preString = [self substringToIndex:1];
return [predicate evaluateWithObject:preString];
}
- 字母排序
[resultMuArray sortedArrayUsingSelector:@selector(compare:)];
- 添加带搜索符号的索引字符
[rightIndexArray insertObject:UITableViewIndexSearch atIndex:0];
- 添加searchBar
self.showTableView.tableHeaderView = self.searchController.searchBar;
#pragma mark - property
-(UISearchController *)searchController
{
if (!_searchController) {
_searchController = [[UISearchController alloc]initWithSearchResultsController:nil];
_searchController.searchResultsUpdater = self;
_searchController.delegate = self;
_searchController.dimsBackgroundDuringPresentation = YES;
_searchController.hidesNavigationBarDuringPresentation = YES;
_searchController.searchBar.placeholder = @"Search";
[_searchController.searchBar sizeToFit];
_searchController.searchBar.keyboardType = UIKeyboardTypeDefault;
}
return _searchController;
}
特别注意
我们在字母排序时首先要对数组里面的字母大小写要统一,不然排序错乱。
我们在对字符串进行首字母判断时,如果字符串前面有空格或回车则需要去掉。例如
string = [string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];//去除空格和回车
