UIView Subclass
UILabel, 继承于UIView, 标签视图, 用于显示文字
1.创建视图标签, 并设置位置大小
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(20, 100, 375 - 40, 100)];
//文本 label.text = @"Hello world, fine thanks and you Hello world, fine thanks and you"; //对齐方式, 左对齐 label.textAlignment = NSTextAlignmentCenter; //文本颜色, 默认黑色 label.textColor = [UIColor colorWithRed:0.400 green:0.400 blue:1.000 alpha:1.000];
字体(样式, 大小), 默认: 17号字, 系统样式
UIFont, 字体类, 继承于NSObject
使用系统字体
label.font = [UIFont systemFontOfSize:24];
自定义字体
UIFont *font2 = [UIFont fontWithName:@"Bangla Sangam MN" size:24];
显示所有字体样式的名称
NSLog(@"%@", [UIFont familyNames]);
行数, 默认是1, 0代表根据文字自动设置行数
label.numberOfLines = 0;
文字的阴影颜色
label.shadowColor = [UIColor grayColor];
文字的阴影偏移
label.shadowOffset = CGSizeMake(2, 1);
换行模式
label.lineBreakMode = NSLineBreakByWordWrapping;
2.设置属性
label.backgroundColor = [UIColor cyanColor];
3.添加到父视图
[self.window addSubview:label];
4.释放
[label release];
UITextField, 单行文本输入框, 继承于UIControl
cmd + k 模拟键盘显示
UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(20, 240, 375 - 40, 40)]; textField.backgroundColor = [UIColor colorWithWhite:0.800 alpha:1.000];
属性
// 占位符 textField.placeholder = @"请输入你的密码"; //文本 textField.text = @""; //边框样式, 默认: none textField.borderStyle = UITextBorderStyleRoundedRect; //文字颜色 textField.textColor = [UIColor magentaColor]; //字体 textField.font = [UIFont systemFontOfSize:26]; //是否安全输入, 默认为: NO textField.secureTextEntry = NO;
清除按钮的显示模式
UITextFieldViewModeNever: 不显示
UITextFieldViewModeWhileEditing: 编辑时显示
UITextFieldViewModeWhileEditing: 不编辑时显示
UITextFieldViewModeAlways: 有内容时一直显示
textField.clearButtonMode = UITextFieldViewModeWhileEditing;
重新开始编辑时, 是否清除内容
textField.clearsOnBeginEditing = YES;
//键盘返回键的样式 textField.returnKeyType = UIReturnKeyDone; //让appdelegate成为textField的代理 textField.delegate = self; //键盘样式 textField.keyboardType = UIKeyboardTypeDefault; [self.window addSubview:textField]; [textField release];
//UITextFieldDelegate, 类名+代理(系统的协议命名是固定的) @interface AppDelegate : UIResponder <UIApplicationDelegate, UITextFieldDelegate>
UIButton, 按钮类, 继承于UIControl, 可以接收用户的点击, 并实现某些功能
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; button.frame = CGRectMake(100, 320, 375 - 200, 40); button.backgroundColor = [UIColor colorWithRed:0.400 green:1.000 blue:0.400 alpha:1.000];
button标题
//正常状态 [button setTitle:@"确认" forState:UIControlStateNormal]; //高亮状态, 长按 [button setTitle:@"登陆" forState:UIControlStateHighlighted]; //不可用状态 [button setTitle:@"无效" forState:UIControlStateDisabled]; //选中状态 [button setTitle:@"选中" forState:UIControlStateSelected]; //是否可用, 默认YES button.enabled = YES; //是否选中 button.selected = NO;
//标题颜色 [button setTitleColor:[UIColor colorWithRed:0.251 green:0.000 blue:0.502 alpha:1.000] forState:UIControlStateNormal]; //标题文字大小, button是一个复合视图(由多个视图组成), 其中显示文字就是titleLable button.titleLabel.font = [UIFont systemFontOfSize:24];
设置button图片
UIImage, 图片类, 继承于NSObject
注: png可以省略后缀, 其他格式必须写后缀
[button setImage:[UIImage imageNamed:@"button"] forState:UIControlStateNormal];
设置背景图片
[button setBackgroundImage:[UIImage imageNamed:@"button"] forState:UIControlStateNormal];
点击button, 执行某个操作(方法)
参数1: 方法的执行者
参数2: 执行哪一个方法
参数3: 什么时候执行方法
- (void)pressButton { self.window.backgroundColor = [UIColor colorWithRed:arc4random() % 266 / 255.0 green:arc4random() % 266 / 255.0 blue:arc4random() % 266 / 255.0 alpha:arc4random() % 266 / 255.0]; }
[button addTarget:self action:@selector(pressButton) forControlEvents:UIControlEventTouchUpInside];
[self.window addSubview:button];
label = [[UILabel alloc] initWithFrame:CGRectMake(20, 60, 335, 40)]; label.backgroundColor = [UIColor whiteColor]; // label.tag = 102; [self.window addSubview:label]; [label release]; textField = [[UITextField alloc] initWithFrame:CGRectMake(20, 120, 335, 40)]; textField.backgroundColor = [UIColor whiteColor]; textField.placeholder = @"请输入内容"; // textField.tag = 101; [self.window addSubview:textField]; [textField release]; UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; button.frame = CGRectMake(120, 180, 120, 40); button.backgroundColor = [UIColor blueColor]; [button setTitle:@"OK" forState:UIControlStateNormal]; [button addTarget:self action:@selector(submit) forControlEvents:UIControlEventTouchUpInside]; [self.window addSubview:button];
- (void)submit { NSLog(@"hi"); //1, UIView tag //父视图通过tag值, 找到某个子视图 // UITextField *textField = (UITextField *)[self.window viewWithTag:101]; // NSLog(@"%@", textField.text); // UILabel *label = (UILabel *)[self.window viewWithTag:102]; // label.text = textField.text; //2. 扩大变量的作用域, 写成实例变量 label.text = textField.text; }
//实例变量 @interface AppDelegate () { UITextField *textField; UILabel *label; }
#pragma mark - UITextFieldDelegate - (BOOL)textFieldShouldReturn:(UITextField *)textField { NSLog(@"点击了return按钮"); //让textField的键盘收回, 结束编辑 [textField resignFirstResponder]; return YES; } //textField是否允许编辑 - (BOOL)textFieldShouldBeginEditing:(UITextField *)textField { return YES; } - (void)textFieldDidBeginEditing:(UITextField *)textField { NSLog(@"已经开始编辑"); } //textField是否允许结束编辑 - (BOOL)textFieldShouldEndEditing:(UITextField *)textField { return YES; } - (void)textFieldDidEndEditing:(UITextField *)textField { NSLog(@"已经结束编辑"); } //是否允许对当前的字符串进行修改 - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { NSLog(@"location: %lu length: %lu %@", range.location, range.length, string); if ([string isEqualToString:@"a"]) { return NO; } return YES; } //控制清除按钮是否有效 - (BOOL)textFieldShouldClear:(UITextField *)textField { return NO; }
原文：http://www.cnblogs.com/OrangesChen/p/4886542.html