Implement WeChat address book UI, contact pinyin initials grouped by the A to Z, and contain the contact search function
else if (c != lastC){
lastC = c;
if (data && data.count > 0) {
[ans addObject:data];
}
data = [[NSMutableArray alloc] init];
[data addObject:user];
}
else {
[data addObject:user];
如果是英语小写的字母，分组会在table的最后生成一个分组
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