1.NSAttributedString

這個(gè)類主要是 text字符的屬性.

有幾個(gè)常用的屬性

NSFontAttributeName
NSForegroundColorAttributeName
NSBackgroundColorAttributeName 
NSStrokeColorAttributeName 
NSStrokeWidthAttributeName 

最簡(jiǎn)單的例子

隨意自定義一個(gè)view

- (void)drawRect:(CGRect)rect
{
    CGContextRef  context = UIGraphicsGetCurrentContext();
    [self drawText:context];
}


- (void)drawText1:(CGContextRef)context
{
    NSString *str1 = @"string ";
    
    NSLog(@"%@",[UIFont familyNames]);
    NSDictionary *attributes1 = @{NSFontAttributeName:[UIFont fontWithName:@"Snell Roundhand" size:50]};
    [str1 drawAtPoint:CGPointMake(100, 100) withAttributes:attributes1];
}

如果字體不知道，可以調(diào)用

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

輸入結(jié)果如下

(
    Thonburi,
    "Khmer Sangam MN",
    "Snell Roundhand",
    "Academy Engraved LET",
    ......
)

這是簡(jiǎn)單的一個(gè)例子

又寫了一個(gè)復(fù)雜些的例子，其中用到了NSMutableParagraphStyle

- (void)drawText2:(CGContextRef)context
{
    
    NSString *str2 =@"hellowold hellowold hellowold hellowold hellowold hellowold hellowold hellowold hellowold hellowold hellowold hellowold hellowold hellowold hellowold hellowold hellowold hellowold hellowold hellowold hellowold hellowold";
   
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init];
    [paragraphStyle setAlignment:NSTextAlignmentLeft];
    [paragraphStyle setLineBreakMode:NSLineBreakByCharWrapping];
    [paragraphStyle setHeadIndent:35];
    
    
    CGRect rect = CGRectMake(50, 150, 200, 100);
    [[UIColor lightGrayColor] set];
    UIRectFill(rect);
    
    NSDictionary *attributes2 =
    @{NSFontAttributeName:[UIFont fontWithName:@"Didot" size:10],
      NSParagraphStyleAttributeName:paragraphStyle,
      NSForegroundColorAttributeName:[UIColor redColor],
      NSBackgroundColorAttributeName:[UIColor yellowColor]
                                };
    [str2 drawInRect:CGRectMake(50, 150, 200, 100) withAttributes:attributes2];
}

其中

是為了顯示rect，更好的查看輸出的區(qū)域

輸出結(jié)果