OBJECTIVE-C-Uitextfield Input length limit

The Uitextfield class does not have a maximum length attribute and needs to be set through delegate.
1. Inherit the Uitextfielddelegate interface.

@interfaceMYClass () <UITextFieldDelegate>@end

2. Set the interface.

// timesField: 初始化的UITextField[timesField setDelegate:self// 设置限制长度

3. Overriding the function:

 #pragma mark uitextfielddelegate-(BOOL) textfield : (Uitextfield *)  textfield  shouldchangecharactersinrange: (nsrange) range replacementstring: ( NSString *)  string  { //avoid crashing  if  (Range.length + range.location > textfield . text . Length) {return  NO; } Nsuinteger newlength = [textfield .  Text  length] + [string  length]-range.length; //set limit length  return  newlength <= 2 ;} 

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OBJECTIVE-C-Uitextfield Input length limit