键盘控制数字大小

直接通过UITextField的协议里面的一个方法就能直接实现,封装一个&＃xff0c;下回好用。

&＃64;protocol NumTextFieldDelegate &＃64;optional
- (void)greateThanMaxNum; //当大于最大值时触发&＃64;end&＃64;interface SelfTextField : UITextField&＃64;property (nonatomic, assign)float maxNum; //限制的最大数字 默认99999999999
&＃64;property (nonatomic, weak)id numDelegate;&＃64;end

&＃64;implementation SelfTextField- (instancetype)initWithFrame:(CGRect)frame
{self &＃61; [super initWithFrame:frame];if (self) {_maxNum &＃61; 99999999999;self.delegate &＃61; self;self.keyboardType &＃61; UIKeyboardTypeDecimalPad;}return self;
}//调用这个方法即可
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {NSString *amountText &＃61; textField.text;NSString *regStr &＃61; &＃64;"^([1-9][\\d]{0,100}|0)(\\.[\\d]{0,1})?$";NSPredicate *predicate &＃61; [NSPredicate predicateWithFormat:&＃64;"SELF MATCHES %&＃64;", regStr];BOOL match &＃61; [predicate evaluateWithObject:amountText];if ([string isEqualToString:&＃64;""])return YES;NSString *tmpStr &＃61; [amountText stringByAppendingString:string];NSString *numStr &＃61; [[tmpStr componentsSeparatedByString:&＃64;"."] firstObject];float amount &＃61; [numStr floatValue];if (([amountText floatValue] &＃61;&＃61; _maxNum) && (![string isEqualToString:&＃64;""])){return NO;}BOOL result &＃61; [amountText isEqualToString:&＃64;""] ? YES : (match && ((amount <&＃61; _maxNum) || [string isEqualToString:&＃64;"."]));if (result) {NSString * num &＃61; [NSString stringWithFormat:&＃64;"%&＃64;%&＃64;",textField.text,string];result &＃61; [num floatValue] <&＃61; _maxNum ?YES:NO;}if (_numDelegate && [_numDelegate respondsToSelector:&＃64;selector(greateThanMaxNum)] && !result) {[_numDelegate greateThanMaxNum];}return result;
}-(void)dealloc
{self.delegate &＃61; nil;
}