Question

我正在尝试为iphone制作计算器应用程序所以现在我完成了所有操作，如果用户在文本字段中输入了他的第一个数字，然后如果他点击了“+”按钮我希望测试字段开关或制表符到另一个文本字段

所以我该怎么办？这是标题

    #import <UIKit/UIKit.h>
@interface ViewController : UIViewController
{
    int a,b,c;
    char op;
    UILabel*operation,*result;
    UITextField *num1,*num2;  
}
@property (nonatomic)int a , b ,c;
@property (nonatomic)char po;
@property (nonatomic ,retain)IBOutlet UILabel*operation,*result;
@property (nonatomic ,retain)IBOutlet UITextField *num1,*num2;;

-(IBAction)sum:(id)sender;
-(IBAction)Calculate:(id)sender;
-(IBAction)Clear:(id)sender;
-(IBAction)hideKeyboard:(id)sender;
@end

.m文件

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController
@synthesize operation,result,num1,num2,a,b,c,po;
-(IBAction)sum:(id)sender{
    operation.text=@"+";


}
-(IBAction)hideKeyboard:(id)sender{
    [num1 resignFirstResponder];   
    [num2 resignFirstResponder];
}
-(IBAction)Calculate:(id)sender{

    //sum
    a =num1.text.integerValue;
    b= num2.text.integerValue;
    c=num1.text.integerValue+num2.text.integerValue;
    printf("%i >> %i",b,num2.text.integerValue);
    [num1 resignFirstResponder];
    [num2 resignFirstResponder];
    result.text =[NSString stringWithFormat:@"%i + %i = %i",a,b,c];



}
-(IBAction)Clear:(id)sender{
    [num1 resignFirstResponder];
    [num2 resignFirstResponder];
    num1.text=@"";
    num2.text=@"";
    operation.text=@"";
    a=0;
    b=0;
    c=0;
    result.text=@"";
    op=' ';

}

Answer 1

如果我正确理解您的代码，在用户输入后，第一个-sum:sender被调用。您只需在第二个UITextField上调用becomeFirstResponder。

-(IBAction)sum:(id)sender{
    operation.text=@"+";
    [num2 becomeFirstResponder];
}

如何通过按下按钮从文本字段1到文本字段2

1 个答案: