Skip to content

Latest commit

 

History

History
223 lines (170 loc) · 6.14 KB

uitextfield_uilabel_tu_wen_hun_pai.md

File metadata and controls

223 lines (170 loc) · 6.14 KB
Raw

UITextField UILabel 图文混排

Update更新：2016年5月9日 By {MISSAJJ琴瑟静听}

修改UITextField的光标颜色

textField.tintColor = [UIColor whiteColor];

UITextField占位文字相关的设置

// 设置占位文字内容
@property(nullable, nonatomic,copy)   NSString               *placeholder;
// 设置带有属性的占位文字, 优先级 > placeholder
@property(nullable, nonatomic,copy)   NSAttributedString     *attributedPlaceholder;

NSAttributedString

  • 带有属性的字符串, 富文本
  • 由2部分组成
    • 文字内容 : NSString *
    • 文字属性 : NSDictionary *
      • 文字颜色 - NSForegroundColorAttributeName
      • 字体大小 - NSFontAttributeName
      • 下划线 - NSUnderlineStyleAttributeName
      • 背景色 - NSBackgroundColorAttributeName
  • 初始化
NSMutableDictionary *attributes = [NSMutableDictionary dictionary];
attributes[NSForegroundColorAttributeName] = [UIColor yellowColor];
attributes[NSBackgroundColorAttributeName] = [UIColor redColor];
attributes[NSUnderlineStyleAttributeName] = @YES;
NSAttributedString *string = [[NSAttributedString alloc] initWithString:@"123" attributes:attributes];
  • 使用场合
    • UILabel - attributedText
    • UITextField - attributedPlaceholder

NSMutableAttributedString

  • 继承自NSAttributedString
  • 常见方法
// 设置range范围的属性, 重复设置同一个范围的属性, 最后一次设置才是有效的(之前的设置会被覆盖掉)
- (void)setAttributes:(nullable NSDictionary<NSString *, id> *)attrs range:(NSRange)range;
// 添加range范围的属性, 同一个范围, 可以不断累加属性
- (void)addAttribute:(NSString *)name value:(id)value range:(NSRange)range;
- (void)addAttributes:(NSDictionary<NSString *, id> *)attrs range:(NSRange)range;
  • 图文混排
UILabel *label = [[UILabel alloc] init];
label.frame = CGRectMake(100, 100, 200, 25);
label.backgroundColor = [UIColor redColor];
label.font = [UIFont systemFontOfSize:14];
[self.view addSubview:label];

// 图文混排
NSMutableAttributedString *attributedText = [[NSMutableAttributedString alloc] init];
// 1 - 你好
NSAttributedString *first = [[NSAttributedString alloc] initWithString:@"你好"];
[attributedText appendAttributedString:first];

// 2 - 图片
// 带有图片的附件对象
NSTextAttachment *attachment = [[NSTextAttachment alloc] init];
attachment.image = [UIImage imageNamed:@"header_cry_icon"];
CGFloat lineH = label.font.lineHeight;
attachment.bounds = CGRectMake(0, - ((label.xmg_height - lineH) * 0.5 - 1), lineH, lineH);
// 将附件对象包装成一个属性文字
NSAttributedString *second = [NSAttributedString attributedStringWithAttachment:attachment];
[attributedText appendAttributedString:second];

// 3 - 哈哈哈
NSAttributedString *third = [[NSAttributedString alloc] initWithString:@"哈哈哈"];
[attributedText appendAttributedString:third];

label.attributedText = attributedText;
  • 一个Label显示多行不同字体的文字
UILabel *label = [[UILabel alloc] init];
// 设置属性文字
NSString *text = @"你好\n哈哈哈";
NSMutableAttributedString *attributedText = [[NSMutableAttributedString alloc] initWithString:text];
[attributedText addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:10] range:NSMakeRange(0, text.length)];
[attributedText addAttribute:NSFontAttributeName value:[UIFont boldSystemFontOfSize:13] range:NSMakeRange(3, 3)];
label.attributedText = attributedText;
// 其他设置
label.numberOfLines = 0;
label.textAlignment = NSTextAlignmentCenter;
label.frame = CGRectMake(0, 0, 100, 40);
[self.view addSubview:label];
self.navigationItem.titleView = label;

修改UITextField占位文字的颜色

  • 使用attributedPlaceholder
@property(nullable, nonatomic,copy)   NSAttributedString     *attributedPlaceholder;
  • 重写- (void)drawPlaceholderInRect:(CGRect)rect;
- (void)drawPlaceholderInRect:(CGRect)rect;
  • 修改内部占位文字Label的文字颜色
[textField setValue:[UIColor grayColor] forKeyPath:@"placeholderLabel.textColor"];

如何监听一个控件内部的事件

  • 如果继承自UIControl
- (void)addTarget:(nullable id)target action:(SEL)action forControlEvents:(UIControlEvents)controlEvents;

  • 代理

  • 通知

  • 利用内部的某些机制

    • 比如重写UITextField的becomeFirstResponder和resignFirstResponder来监听UITextField的获得焦点和失去焦点事件

  • 用途

    • assign一般用在基本数据类型上面, 比如int\double等
    • weak一般用在代理对象上面, 或者用来解决循环强引用的问题

监听UITextField的获得焦点和失去焦点事件

  • addTarget
[textField addTarget:target action:@selector(editingDidBegin) forControlEvents:UIControlEventEditingDidBegin];
[textField addTarget:target action:@selector(editingDidEnd) forControlEvents:UIControlEventEditingDidEnd];

UIControlEventEditingDidBegin
1.开始编辑
2.获得焦点
3.弹出键盘

UIControlEventEditingDidEnd
1.结束编辑
2.失去焦点
3.退下键盘
  • delegate
textField.delegate = self;

#pragma mark - <UITextFieldDelegate>
- (void)textFieldDidBeginEditing:(UITextField *)textField
{

}

- (void)textFieldDidEndEditing:(UITextField *)textField
{

}
  • 通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(beginEditing) name:UITextFieldTextDidBeginEditingNotification object:textField];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(endEditing) name:UITextFieldTextDidEndEditingNotification object:textField];

- (void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)beginEditing
{

}

- (void)endEditing
{

}
  • 重写UITextField的becomeFirstResponder和resignFirstResponder方法
/**
 *  调用时刻 : 成为第一响应者(开始编辑\弹出键盘\获得焦点)
 */
- (BOOL)becomeFirstResponder
{

    return [super becomeFirstResponder];
}

/**
 *  调用时刻 : 不做第一响应者(结束编辑\退出键盘\失去焦点)
 */
- (BOOL)resignFirstResponder
{

    return [super resignFirstResponder];
}