类似备忘录的文本 -- 设置行高和每一行的下划线

 

#import "EHTextView.h"

@implementation EHTextView

- (instancetype)initWithFrame:(CGRect)frame
                      andText:(NSString *)mText
{
    self = [super initWithFrame:frame];

    if (self)
    {
        NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];

        // 行间距
        paragraphStyle.lineHeightMultiple = 40;
        paragraphStyle.maximumLineHeight = 40;
        paragraphStyle.minimumLineHeight = 40;
        self.textContainerInset = UIEdgeInsetsMake(-10, 0, 0, 0);
        NSString *oneRowStr = [mText substringWithRange:NSMakeRange(0, [mText rangeOfString:@"\n"].location)];
        NSMutableAttributedString *prefixAttr = [[NSMutableAttributedString alloc] initWithString:mText];
        [prefixAttr addAttribute:NSFontAttributeName value:FZHei(17) range:NSMakeRange(0, mText.length)];
        [prefixAttr addAttribute:NSForegroundColorAttributeName value:ColorHui range:NSMakeRange(0, mText.length)];
        [prefixAttr addAttribute:NSFontAttributeName value:FZHei(17) range:NSMakeRange(0, oneRowStr.length)];
        [prefixAttr addAttribute:NSForegroundColorAttributeName value:ColorHuiHei range:NSMakeRange(0, oneRowStr.length)];
        [prefixAttr addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, mText.length)];
        self.attributedText = prefixAttr;

        self.backgroundColor = [UIColor clearColor];
        self.userInteractionEnabled = NO;
    }

    return self;
}

 
- (void)drawRect:(CGRect)rect {
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetStrokeColorWithColor(context, HexRGB(0xd2d2d2).CGColor);
    CGContextSetLineWidth(context, 0.5f);
    CGContextBeginPath(context);
    CGFloat rowH = 40;
    NSUInteger numberOfLines =  (self.bounds.size.height - 15) / rowH;
    CGFloat baselineOffset = 0;
    for (int x = 1; x < numberOfLines + 1; x++) {
        CGContextSetStrokeColorWithColor(context, [UIColor lightGrayColor].CGColor);
        CGFloat lengthstest[] = {5,2};
        CGContextSetLineDash(context, 2, lengthstest,1);
        CGContextMoveToPoint(context, 2, rowH * x  + baselineOffset);
        CGFloat rowW = numberOfLines == x ? 35 : 0;
        CGContextAddLineToPoint(context, CGRectGetWidth(rect) - rowW, rowH * x + baselineOffset);
        CGContextStrokePath(context);
    }

    CGContextStrokePath(context);
}

@end