//截取字符串
-(NSString*)cutString:(NSString*)str
{
NSMutableString*c = [[NSMutableStringalloc]init];
//需要的长度
intposition =4;
for(inti =0; i < str.length; i++){
if(position ==0){
break;
}
unicharch = [strcharacterAtIndex:0];
if(0x4e00< ch&& ch <0x9fff)
{
//若为汉字
[cappendString:[strsubstringWithRange:NSMakeRange(i,1)]];
position = position -2;
}else{
[cappendString:[strsubstringWithRange:NSMakeRange(i,1)]];
position = position -1;
}
}
returnc;
}
