-(BOOL)textField:(UITextField*)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString*)string {
NSString*text = [textFieldtext];
NSCharacterSet*characterSet = [NSCharacterSetcharacterSetWithCharactersInString:@"0123456789\b"];
string = [stringstringByReplacingOccurrencesOfString:@" "withString:@""];
if([stringrangeOfCharacterFromSet:[characterSetinvertedSet]].location!=NSNotFound) {
returnNO;
}
text = [textstringByReplacingCharactersInRange:rangewithString:string];
text = [textstringByReplacingOccurrencesOfString:@" "withString:@""];
// 如果是电话号码格式化，需要添加这三行代码
NSMutableString*temString = [NSMutableStringstringWithString:text];
[temStringinsertString:@" "atIndex:0];
text = temString;
NSString*newString =@"";
while(text.length>0) {
NSString*subString = [textsubstringToIndex:MIN(text.length,4)];
newString = [newStringstringByAppendingString:subString];
if(subString.length==4) {
newString = [newStringstringByAppendingString:@" "];
}
text = [textsubstringFromIndex:MIN(text.length,4)];
}
newString = [newStringstringByTrimmingCharactersInSet:[characterSetinvertedSet]];
if(newString.length>=14) {
returnNO;
}
[textFieldsetText:newString];
returnNO;
}
这段代码是极好的：不但一个个输入字符时没有问题，而且可以实现，复制粘贴过来后再实现格式化
