UILabe小记

UILabel

UILabel 继承自 UIView

1.初始化

   UILabel * label = [[UILabel alloc]initWithFrame:CGRectMake(10, 100, 300, 60)];

   CGRectMake(x, y, w, h); 是指定label的位置	

2.设置相关属性

1、设置颜色

 label.backgroundColor = [UIColor cyanColor];

2、设置文字
```
 label.text = @"GitHubPages";
```

3、设置字体颜色

 label.textColor = [UIColor whiteColor];

4、设置字体大小

 label.font = [UIFont systemFontOfSize:30.0];

5、设置字体类型

   label.font = [UIFont  fontWithName:@"Arial" size:23.0];

6、遍历系统所有字体

 label.font = [UIFont systemFontOfSize:30.0];

7、设置字体类型

   label.font = [UIFont  fontWithName:@"Arial" size:23.0];

8 遍历系统所有字体

for (NSString * name in [UIFont familyNames]){

	NSLog(@"字体名字：%@",name);

}

NSLog(@"%@",[UIFont familyNames]);

9、设置文本的显示行数, 换行时以单词换行，，，设置为0后，自动匹配行数
```
label.numberOfLines = 0;
```

10、设置文本换行时的截取方式

  // NSParagraphStyle   剪切单词的方式
  typedef NS_ENUM(NSInteger, NSLineBreakMode) {
    
  	/* What to do with long lines */
    	
  以空格为边界，保留整个单词    
  NSLineBreakByWordWrapping = 0,     	/* Wrap at word boundaries, default */
    
  保留整个字符
  NSLineBreakByCharWrapping,		/* Wrap at character boundaries */
    
  剪切到边界位置，简单剪切
  NSLineBreakByClipping,		/* Simply clip */
    
  按照“...wxyz”显示
  NSLineBreakByTruncatingHead,	/* Truncate at head of line: "...wxyz" */
    
  按照"abcd..."显示
  NSLineBreakByTruncatingTail,	/* Truncate at tail of line: "abcd..." */
    
  按照"ab...yz"显示
  NSLineBreakByTruncatingMiddle	/* Truncate middle of line:  "ab...yz" */
    
  } NS_ENUM_AVAILABLE_IOS(6_0);


  简单剪切
  label.lineBreakMode = NSLineBreakByClipping;

11、设置阴影效果

11.1、设置阴影颜色

label.shadowColor = [UIColor whiteColor];

11.2、设置阴影的偏移量

label.shadowOffset = CGSizeMake(2, 0.5);

12、设置文本的对齐方式

  Values for NSTextAlignment */
  typedef NS_ENUM(NSInteger, NSTextAlignment) {
    	
    左对齐
    NSTextAlignmentLeft      = 0,    // Visually left aligned
      
  #if TARGET_OS_IPHONE
    
    居中
    NSTextAlignmentCenter    = 1,    // Visually centered
    右对齐
    NSTextAlignmentRight     = 2,    // Visually right aligned
      
  #else /* !TARGET_OS_IPHONE */
    
    NSTextAlignmentRight     = 1,    // Visually right aligned
      
     NSTextAlignmentCenter    = 2,    // Visually centered
       
  #endif
    	
     NSTextAlignmentJustified = 3,    // Fully-justified. The last line in a paragraph is natural-aligned.
       
     NSTextAlignmentNatural   = 4,    // Indicates the default alignment for script
       
  } NS_ENUM_AVAILABLE_IOS(6_0);
  居中对齐
  label.textAlignment = NSTextAlignmentCenter;

3. 添加到父视图上

	[self.window addSubview:label];

4. 释放(在MRC下使用)

	[label release];