#import #import "Calculator.h" //#import "NSString+FloatHandle.h" @interface CalculatorViewController : UIViewController @property(nonatomic,strong)UITextField *TF; @property(nonatomic,strong)Calculator *cl; @property(nonatomic,assign)NSInteger emptyCount; /*密码用于关闭计算器界面*/ @property(nonatomic,copy)NSString *pwd; @end