ios开发--常用基本控件(截取登陆部分)

一:UITextField

_messageText=[[UITextField alloc]init];

_messageText.borderStyle=UITextBorderStyleRoundedRect;

_messageText.placeholder=@"SSSS";

_messageText.font=[UIFont fontWithName:@"Arial" size:15.0f];

_messageImage=[[UIImageView alloc]initWithImage:[UIImage imageNamed:@"account-"]];

_messageText.leftView=_messageImage;

_messageText.leftViewMode=UITextFieldViewModeAlways;

_messageText.keyboardType=UIKeyboardTypeDefault;

//密码隐藏

_messageText.secureTextEntry = YES;

_messageText.delegate=self;

[self.view addSubview:_messageText];

//点击空白区域回收键盘,并且view回到初始状态

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{

[_messageText resignFirstResponder];

}

//点击键盘Return建回收键盘,并且view回到初始状态

- (BOOL)textFieldShouldReturn:(UITextField *)textField {

[_messageText resignFirstResponder];

return YES;

}

二:UIButton

_loginButton=[[UIButton alloc]init];

_loginButton.backgroundColor=[UIColor colorWithRed:52/255.f green:138/255.f blue:76/255.f alpha:1.00];

[_loginButton setTitle:@"登录" forState:UIControlStateNormal];

[_loginButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];

[_loginButton addTarget:self action:@selector(loginBut:) forControlEvents:UIControlEventTouchUpInside];

//button点击事件,包括判断用户,密码的输入状态,以及弹窗

-(void)loginBut:(UIButton *)button{

if ([self.messageText.text compare:@""]==NSOrderedSame ||[self.passText.text compare:@""]==NSOrderedSame )

{

UIAlertView *alertV = [[UIAlertView alloc]initWithTitle:@"提示" message:@"用户、密码不能为空"  delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];

[alertV show];

}else if (self.messageText.text.length <4 || self.passText.text.length<6)

{

UIAlertView *alertV = [[UIAlertView alloc]initWithTitle:@"提示" message:@"用户名密码不匹配)"  delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];

[alertV show];

}

}

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