学习了一些基础控件之后来用代码写一个登录界面吧，
这是登录的页面：
下面看一下注册的页面：
是不是看见界面很有感觉????，来看代码~
首先我们先把这些要用到的部分控件声明成全局变量：
@interface ViewController (){
UITextField *tf3;
UITextField *tf2;
UITextField *tf1;
UIView *view1;
UIView *view;
}
@end
然后就是我们的登录页面：
- (void)signIn{
view = [[UIView alloc] init];
view.frame = CGRectMake(0, 0, 320, 480);
view.backgroundColor = [UIColor grayColor];
[self.view addSubview:view];
//背景
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
imageView.image = [UIImage imageNamed:@"1.jpg"];
imageView.userInteractionEnabled = YES;
[view addSubview:imageView];
//标签
UILabel *label1 = [[UILabel alloc] init];
label1.frame = CGRectMake(30, 150, 80, 50);
label1.text = @"用户名：";
label1.font = [UIFont systemFontOfSize:20];
[imageView addSubview:label1];
UILabel *label2 = [[UILabel alloc] init];
label2.frame = CGRectMake(30, 200, 80, 50);
label2.text = @"密 码：";
label2.font = [UIFont systemFontOfSize:20];
[imageView addSubview:label2];
//输入框
UITextField *tf4 = [[UITextField alloc] init];
tf4.frame = CGRectMake(110, 150, 190, 40);
tf4.placeholder = @"请输入用户名！";
tf4.borderStyle = UITextBorderStyleRoundedRect;
tf4.clearButtonMode = UITextFieldViewModeUnlessEditing;
// tf4.keyboardType = UIKeyboardTypeNumberPad;
[imageView addSubview:tf4];
UITextField *tf5 = [[UITextField alloc] init];
tf5.frame = CGRectMake(110, 200, 190, 40);
tf5.placeholder = @"请输入密码！";
tf5.secureTextEntry = YES;
tf5.borderStyle = UITextBorderStyleRoundedRect;
tf5.clearButtonMode = UITextFieldViewModeUnlessEditing;
// tf5.keyboardType = UIKeyboardTypeNumberPad;
[imageView addSubview:tf5];
//按钮
UIButton *btn1 = [[UIButton alloc] init];
btn1.frame = CGRectMake(60, 280, 100, 40);
// btn1.backgroundColor = [UIColor greenColor];
[btn1 setTitle:@"登陆" forState:UIControlStateNormal];
[btn1 setTitleColor:[UIColor greenColor] forState:UIControlStateNormal];
btn1.tag = 100;
btn1.titleLabel.font = [UIFont systemFontOfSize:20];
[btn1 addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
// 设置背景图片
UIImage *image = [UIImage imageNamed:@"3"];
[btn1 setBackgroundImage:image forState:UIControlStateNormal];
[imageView addSubview:btn1];
UIButton *btn2 = [[UIButton alloc] init];
btn2.frame = CGRectMake(180, 280, 100, 40);
// btn2.backgroundColor = [UIColor greenColor];
[btn2 setTitle:@"注册" forState:UIControlStateNormal];
[btn2 setTitleColor:[UIColor greenColor] forState:UIControlStateNormal];
btn2.tag = 200;
btn2.titleLabel.font = [UIFont systemFontOfSize:20];
[btn2 addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
// 设置背景图片
[btn2 setBackgroundImage:image forState:UIControlStateNormal];
[imageView addSubview:btn2];
}
这里我们做了一个判断，如代码所示，下面实现以下按钮绑定的方法，两个按钮绑定的是一个方法，绑定的时候添加一个 : 意思就是把这个按钮传递过去，方便我们以后做区分，然后根据tag值来判断是哪一个按钮，根据按钮做不同的操作，这里还添加了一个简单的翻页动画：
#pragma mark 点击方法
- (void)btnClick:(UIButton *)sentBtn{
if (sentBtn.tag == 100) {
//提示未完成功能
UIAlertView *ts =[[UIAlertView alloc] init];
ts.title = @"SORRY";
ts.message = @"登陆更能尚未实现 请稍后 \n ^_^~~~";
[ts addButtonWithTitle:@"返回"];
[ts show];
}
if (sentBtn.tag == 200) {
[view removeFromSuperview];
//翻页动画
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:2.0];
[UIView setAnimationTransition:UIViewAnimationTransitionCurlUp forView:self.view cache:YES];
[UIView commitAnimations];
//创建一个子视图
view1 = [[UIView alloc] init];
view1.frame = CGRectMake(0, 0, 320, 480);
view1.backgroundColor = [UIColor grayColor];
[self.view addSubview:view1];
//背景
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
imageView.image = [UIImage imageNamed:@"1.jpg"];
imageView.userInteractionEnabled = YES;
[view1 addSubview:imageView];
//标签
UILabel *label1 = [[UILabel alloc] init];
label1.frame = CGRectMake(30, 100, 100, 50);
label1.text = @"用 户 名 ：";
label1.font = [UIFont systemFontOfSize:20];
[imageView addSubview:label1];
UILabel *label2 = [[UILabel alloc] init];
label2.frame = CGRectMake(30, 150, 100, 50);
label2.text = @"密 码 ：";
label2.font = [UIFont systemFontOfSize:20];
[imageView addSubview:label2];
UILabel *label3 = [[UILabel alloc] init];
label3.frame = CGRectMake(30, 200, 100, 50);
label3.text = @"再次密码：";
label3.font = [UIFont systemFontOfSize:20];
[imageView addSubview:label3];
//输入框
tf1 = [[UITextField alloc] init];
tf1.frame = CGRectMake(150, 109, 150, 40);
tf1.placeholder = @"请输入用户名！";
// tf1.secureTextEntry = YES;
tf1.borderStyle = UITextBorderStyleRoundedRect;
tf1.clearButtonMode = UITextFieldViewModeUnlessEditing;
[view1 addSubview:tf1];
tf2 = [[UITextField alloc] init];
tf2.frame = CGRectMake(150, 159, 150, 40);
tf2.placeholder = @"请输入密码！";
tf2.secureTextEntry = YES;
tf2.borderStyle = UITextBorderStyleRoundedRect;
tf2.clearButtonMode = UITextFieldViewModeUnlessEditing;
[imageView addSubview:tf2];
tf3 = [[UITextField alloc] init];
tf3.frame = CGRectMake(150, 209, 150, 40);
tf3.placeholder = @"请再次输入密码！";
tf3.secureTextEntry = YES;
tf3.borderStyle = UITextBorderStyleRoundedRect;
tf3.clearButtonMode = UITextFieldViewModeUnlessEditing;
[imageView addSubview:tf3];
//按钮
UIButton *btn = [[UIButton alloc] init];
btn.frame = CGRectMake(50, 310, 100, 50);
// btn2.backgroundColor = [UIColor greenColor];
[btn setTitle:@"提交" forState:UIControlStateNormal];
[btn setTitleColor:[UIColor greenColor] forState:UIControlStateNormal];
btn.tag = 300;
btn.titleLabel.font = [UIFont systemFontOfSize:20];
[btn addTarget:self action:@selector(btnClick1:) forControlEvents:UIControlEventTouchUpInside];
// 设置背景图片
UIImage *image = [UIImage imageNamed:@"3"];
[btn setBackgroundImage:image forState:UIControlStateNormal];
[imageView addSubview:btn];
UIButton *btn1 = [[UIButton alloc] init];
btn1.frame = CGRectMake(170, 310, 100, 50);
// btn2.backgroundColor = [UIColor greenColor];
[btn1 setTitle:@"返回" forState:UIControlStateNormal];
[btn1 setTitleColor:[UIColor greenColor] forState:UIControlStateNormal];
btn1.tag = 400;
btn1.titleLabel.font = [UIFont systemFontOfSize:20];
[btn1 addTarget:self action:@selector(btnClick1:) forControlEvents:UIControlEventTouchUpInside];
// 设置背景图片
// UIImage *image = [UIImage imageNamed:@"3"];
[btn1 setBackgroundImage:image forState:UIControlStateNormal];
[imageView addSubview:btn1];
}
}
下面是注册页面的按钮点击事件，这里做了一些验证判断，还有返回登陆页面的翻页动画：
- (void)btnClick1:(UIButton *)sendBtn{
if (sendBtn.tag == 300) {
UIAlertView *ts =[[UIAlertView alloc] init];
// NSLog(@"tf1=======>>>>>> %@",tf1.text);
// NSLog(@"tf2=======>>>>>> %@",tf2.text);
// NSLog(@"tf3=======>>>>>> %@",tf3.text);
// NSLog(@"%d",tf2.text.length);
if ([tf1.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]].length == 0 ) {
ts.message = @"用户名不能为空！";
[ts addButtonWithTitle:@"返回"];
[ts show];
}else{
if (tf2.text.length < 6) {
// UIAlertView *ts =[[UIAlertView alloc] init];
ts.message = @"密码不能少于六位！";
[ts addButtonWithTitle:@"返回"];
[ts show];
}else{
if ([tf2.text isEqual: tf3.text]) {
ts.message = @"注册成功！";
[ts addButtonWithTitle:@"确定"];
[ts show];
[view1 removeFromSuperview];
//翻页动画
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:2.0];
[UIView setAnimationTransition:UIViewAnimationTransitionCurlUp forView:self.view cache:YES];
[UIView commitAnimations];
// [self.window addSubview:view];
}else{
// UIAlertView *ts =[[UIAlertView alloc] init];
// UIAlertView *ts =[[UIAlertView alloc] init];
ts.message = @"两次输入密码不一致！";
[ts addButtonWithTitle:@"返回"];
[ts show];
}
}
}
}
if (sendBtn.tag == 400) {
[view1 removeFromSuperview];
//翻页动画
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:2.0];
[UIView setAnimationTransition:UIViewAnimationTransitionCurlUp forView:self.view cache:YES];
[UIView commitAnimations];
[self.view addSubview:view];
}
}
我们的登录界面就写好了~
在这里我再介绍一个小技能，就是点击输入框的时候系统会弹出一个键盘，但是填完之后觉得它碍事，一般我们的处理就是点击输入框以外的页面就让键盘下落，我这里介绍一个常用的方法：
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
// 让键盘下去，可以借助touch事件触发的touchesBegan方法
// 结束文本框的编辑状态endEditing，键盘就会自动下去
// 让window上的所有文本框结束编辑状态
[self.view endEditing:YES];
}