Label Button和textfield组合

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定义textField属性后的编写
//定义属性的优势是扩大了编写范围
//每定义一条属性只能代表同一类中的一个

    @property(nonatomic,retain)UITextField *textField    - (void)dealloc{         [_textField release];         [super dealloc];    }        self.textField = [[ UITextField alloc ] initWithFrame:CGRectMake (150,200,200,50)];        self.textField.layer.borderWith = 1 ;        self.textField.layer.cornerRadius = 10 ;        [ self.window addSubview:self.textField];        [ _textField release];//不用self.textField释放是因为它会延迟释放        self.textField.secureTextEntry = YES;//定义一个点击方法        [ self.textField addTarget:self action:@selestor(changeValue:) forControlEvents:UIControlEventEditingChanged];//用同样的方法定义label@property(nonatomic,retain)UILabel *label;//不要忘记释放        self.label = [[ UILabel alloc]initWithFrame:CGRectMake(20,200,120,50)];        self.label.backgroundColor = [UIColor yellowColor];        [self.window addSubview:self.label];        [_label release];

将label和textfield组合到一起

根据textfield中输入的长度在label上显示长度是否可以

    - (void)changValue:(UItextField * )textField    {         NSLog(@"%@",textfield.text);         if (textField.text.length > 5){             self.label.text = @"密码长度可以";        }else{            self.label.text = @"密码长度过短";        }    }

这里写图片描述

定义button当单击是打印textField中的文本

//定义button        UIButton * button = [UIButton buttonWithType:UIButtonTypeSystem];        button.frame = CGRectMake(100,250,100,50);        [self.window addSubview:button];//便利构造器的方法不用释放        [button addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];定义打印        -(void)click:(UITextField *)textField        {        //先找到textField,然后再找到里面的对应内容,通过tag找        UITextField *textField0 = (UITextField *)[self.window viewWithTag:1000];        NSLog(@"%@",textField0.text)        //当写textField属性了后        NSLog(@"%@",self.textField.text);

定义button改变textfield状态并改变自身图片

//先给button定义一个clickChange的点击事件//并给button给一个初始状态//先定义一个初始状态        @property(nonatomic,assign)BOOL isClick;        [ changeButton setImage:[UIImage imageNamed:@"check.png"] forState:UIControlStateNormal];        [ changeButton addTarget:self action:@selector(click:) forControlEvents:UIControlEcentTouchUpInside];        self.isClick = YES;//给定一个初始状态//定义变化过程- (void)click:(UIButton *)button{    if(self.isClick){        [changeButton setImage:[UIImage imageNamed:@"checked.png"] forState:UIControlStateNormal];    }else{        [changeButton setImage:[UIImage imageNamed:@"check.png"] forState:UIControlStateNormal];    }        self.isClick = ! self.isClick;        self.textField.secureTextEntry = !self.textField.secureTextEntry;   }

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