UILabel

2018年4月12日
1.目前已经支持文本里面含有换行符\n，在自定义文本间距。

2017年3月24日
一.实现自定义高度的文本行间距
1.效果：

Paste_Image.png

2.实现
第一步定义扩展函数

//  UILabel+Category.h

#import 

@interface UILabel (HSPXAdd)
/*一般控制UILabel中文字不同风格显示的步骤
 1>先设置段落的风格NSMutableParagraphStyle/NSParagraphStyle;
 2>再设置NSAttributedString对象;
 3>NSAttributedString对象赋值给UILabel的attributedText;*/

- (CGSize)multipleLinesSizeWithLineSpacing:(CGFloat)lineSpacing andViewWidth:(CGFloat)viewWidth;
@end

#import "UILabel+Category.h"

@implementation UILabel (HSPXAdd)

+ (instancetype)customLablWithFrame:(CGRect)frame andTitle:(NSString *)text andFont:(UIFont *)font
{
    UILabel *label = [[UILabel alloc] initWithFrame:frame];
    label.text = text;
    label.font = font;
    
    return label;
}

- (CGSize)multipleLinesSizeWithLineSpacing:(CGFloat)lineSpacing andViewWidth:(CGFloat)viewWidth
{
    self.numberOfLines = 0;
    NSString *text = self.text;
    
    if ([text containsString:@"\n"]) {
        
        NSMutableAttributedString * attributedString1 = [[NSMutableAttributedString alloc] initWithString:text];
        NSMutableParagraphStyle * paragraphStyle = [[NSMutableParagraphStyle alloc] init];
        paragraphStyle.alignment = NSTextAlignmentJustified;
        [paragraphStyle setLineSpacing:lineSpacing];
        [attributedString1 addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [text length])];
        NSArray *textArr = [text componentsSeparatedByString:@"\n"];
        CGFloat allRealHeight = 0;
        
        for(int i = 0; i < textArr.count; i++){
            NSString *text = textArr[i];
            if (text.length == 0) {
                text = @"oneLine";
            }
            
            CGFloat oneRowHeight = [@"oneLine" sizeWithAttributes:@{NSFontAttributeName:self.font}].height;
            CGSize textSize = [text boundingRectWithSize:CGSizeMake(viewWidth, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:self.font} context:nil].size;
            CGFloat rows = ceil(textSize.height / oneRowHeight);
            CGFloat realHeight;
            realHeight = (rows * oneRowHeight) + (rows - 1) * lineSpacing;
            allRealHeight += realHeight;
        }
        allRealHeight += (textArr.count - 1) * lineSpacing;
        
        [self setAttributedText:attributedString1];
        return CGSizeMake(viewWidth, allRealHeight);
    }else{
        CGFloat oneRowHeight = [text sizeWithAttributes:@{NSFontAttributeName:self.font}].height;
        CGSize textSize = [text boundingRectWithSize:CGSizeMake(viewWidth, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:self.font} context:nil].size;
        NSMutableAttributedString * attributedString1 = [[NSMutableAttributedString alloc] initWithString:text];
        NSMutableParagraphStyle * paragraphStyle = [[NSMutableParagraphStyle alloc] init];
        paragraphStyle.alignment = NSTextAlignmentJustified;
        [paragraphStyle setLineSpacing:lineSpacing];
        [attributedString1 addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [text length])];
        
        CGFloat rows = textSize.height / oneRowHeight;
        CGFloat realHeight = oneRowHeight;
        if (rows > 1) {
            realHeight = (rows * oneRowHeight) + (rows - 1) * lineSpacing;
        }
        [self setAttributedText:attributedString1];
        return CGSizeMake(textSize.width, realHeight);
    }
    
}

@end

第二步,定义文本自适应行间距接口，其实和上面接口类似【因为即使cell高度的时候，我们还没有UILabel，所有要用文本接口】

//  UIKitTool.h
#import 

@interface UIKitTool : NSObject
//计算带有行间距的文本大小
+ (CGSize)multipleLinesSizeWithLineSpacing:(CGFloat)lineSpacing andViewWidth:(CGFloat)viewWidth andText:(NSString*)text andFont:(UIFont*)font;

@end

//  UIKitTool.m
#import "UIKitTool.h"
@implementation UIKitTool
+ (CGSize)multipleLinesSizeWithLineSpacing:(CGFloat)lineSpacing andViewWidth:(CGFloat)viewWidth andText:(NSString*)text andFont:(UIFont*)font
{
    if([text containsString:@"\n"]){
        NSArray *textArr = [text componentsSeparatedByString:@"\n"];
        CGFloat allRealHeight = 0;
        for(int i = 0; i < textArr.count; i++){
            NSString *text = textArr[i];
            if (text.length == 0) {
                text = @"oneLine";
            }
            CGFloat oneRowHeight = [@"oneLine" sizeWithAttributes:@{NSFontAttributeName:font}].height;
            CGSize textSize = [text boundingRectWithSize:CGSizeMake(viewWidth, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:font} context:nil].size;
            NSMutableAttributedString * attributedString1 = [[NSMutableAttributedString alloc] initWithString:text];
            NSMutableParagraphStyle * paragraphStyle = [[NSMutableParagraphStyle alloc] init];
            paragraphStyle.alignment = NSTextAlignmentJustified;
            [paragraphStyle setLineSpacing:lineSpacing];
            [attributedString1 addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [text length])];
            
            CGFloat rows = ceil(textSize.height / oneRowHeight);
            CGFloat realHeight;
            realHeight = (rows * oneRowHeight) + (rows - 1) * lineSpacing; //
            
            allRealHeight += realHeight;
        }
        allRealHeight += (textArr.count - 1) * lineSpacing;
        
        return CGSizeMake(viewWidth, allRealHeight);
       
    }else{
        CGFloat oneRowHeight = [text sizeWithAttributes:@{NSFontAttributeName:font}].height;
        CGSize textSize = [text boundingRectWithSize:CGSizeMake(viewWidth, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:font} context:nil].size;
        NSMutableAttributedString * attributedString1 = [[NSMutableAttributedString alloc] initWithString:text];
        NSMutableParagraphStyle * paragraphStyle = [[NSMutableParagraphStyle alloc] init];
        paragraphStyle.alignment = NSTextAlignmentJustified;
        [paragraphStyle setLineSpacing:lineSpacing];
        [attributedString1 addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [text length])];
        
        CGFloat rows = textSize.height / oneRowHeight;
        CGFloat realHeight = oneRowHeight;
        if (rows > 1) {
            realHeight = (rows * oneRowHeight) + (rows - 1) * lineSpacing;
        }
        //    [self setAttributedText:attributedString1];
        return CGSizeMake(textSize.width, realHeight);
    }
}
@end

第三步，如下使用即可

//  NewFlowerTableViewCell.h
#define sendWord_lineSpace 4

#import 
@interface NewFlowerTableViewCell : UITableViewCell

- (void)config:(id)model;
+ (CGFloat)cellHeightWithModel:(id)model;

@end

//  NewFlowerTableViewCell.m

@implementation NewFlowerTableViewCell

- (void)layoutAllView:(id )model
{
    NSString *sendWord = @"寄语:该护士很体贴，该护士很体贴，该护士很体贴，该护士很体贴，";
   //////

    //寄语
    if ([sendWord length] > 0) {
        yPos = tempLabel.bottom + sendWord_uMargin;
        tempLabel = _sendWordL;

        CGSize size = [tempLabel multipleLinesSizeWithLineSpacing:sendWord_lineSpace andViewWidth:width];
        height = size.height;
        frame = CGRectMake(xPos, yPos, width, height);
        _sendWordL.frame = frame;
    }
/////
}
+ (CGFloat)cellHeightWithModel:(id)model
{
    NSString *sendWord = @"寄语:该护士很体贴，该护士很体贴，该护士很体贴，该护士很体贴，";


    ////////
    //寄语：
    if ([sendWord length] > 0) {
        NSString *sendStr = [NSString stringWithFormat:@"寄语:%@",sendWord];
        CGSize size = [UIKitTool multipleLinesSizeWithLineSpacing:sendWord_lineSpace andViewWidth:width andText:sendStr andFont:[self getSendWordFont]];
        height += sendWord_uMargin + size.height;
    }
   /////////

    return height;
}

@end

2017年3月5日
一.输出可以变色的文本
1.效果：

Paste_Image.png

2.实现：

//注意str格式 @"题目 %ld / %lu"
- (NSMutableAttributedString *)getChangeColorText:(NSInteger)showNum andTotalNum:(NSUInteger)totalNum
{
    NSString *part1 = @"题目";
    NSString *part2 = [NSString stringWithFormat:@" %ld",showNum];
    NSString *part3 = [NSString stringWithFormat:@" / %lu",totalNum];
    NSInteger len1 = part1.length;
    NSInteger len2 = part2.length;
    NSInteger len3 = part3.length;

    NSString *str = [NSString stringWithFormat:@"%@%@%@",part1,part2,part3];
    NSMutableAttributedString *attributedStr = nil;

    NSInteger length = len1;
    NSInteger index = 0;
    attributedStr = [[NSMutableAttributedString alloc] initWithString:str];
    [attributedStr addAttribute:NSForegroundColorAttributeName
                          value:[HuConfigration uiColorFromString:@"#666666"]
                          range:NSMakeRange(index, length)];

    index = index + length;
    length = len2;
    [attributedStr addAttribute:NSForegroundColorAttributeName
                          value:[HuConfigration uiColorFromString:@"#3DC92B"]
                          range:NSMakeRange(index, length)];

    index = index + length;
    length = len3;
    [attributedStr addAttribute:NSForegroundColorAttributeName
                          value:[HuConfigration uiColorFromString:@"#4D94E2"]
                          range:NSMakeRange(index, length)];

    return attributedStr;
}

或者

{
//        _summaryL.text = [NSString stringWithFormat:@"全部%@题，正确%@题，错误%@题",model.total,model.successCount,model.failCount];
        //变色效果
        NSString *str = [NSString stringWithFormat:@"全部%@题，正确%@题，错误%@题",model.total,model.successCount,model.failCount];
        NSMutableAttributedString *attributedStr = nil;
        attributedStr = [[NSMutableAttributedString alloc] initWithString:str];

        NSString *part1 = [NSString stringWithFormat:@"全部%@题，正确",model.total];
        NSString *part2 = [NSString stringWithFormat:@"%@",model.successCount];
        NSInteger index = part1.length;
        NSInteger length = part2.length;
        [attributedStr addAttribute:NSForegroundColorAttributeName
                              value:[HuConfigration uiColorFromString:@"#3DC92B"]
                              range:NSMakeRange(index, length)];

        part1 = [NSString stringWithFormat:@"全部%@题，正确%@题，错误",model.total,model.successCount];
        part2 = [NSString stringWithFormat:@"%@",model.failCount];
        index = part1.length;
        length = part2.length;
        [attributedStr addAttribute:NSForegroundColorAttributeName
                              value:[HuConfigration uiColorFromString:@"#FF513C"]
                              range:NSMakeRange(index, length)];

        _summaryL.attributedText = attributedStr;
}

3.使用

    _topRightLabel.attributedText = [self getChangeColorText:showNum andTotalNum:totalNum];

    UILabel *tmpLabel = _topRightLabel;
    CGSize size = [tmpLabel.text sizeWithAttributes: @{NSFontAttributeName:tmpLabel.font}];
    tmpLabel.frame = CGRectMake(0, 0, size.width, size.height);

2017年2月5日
1.文本的frame设置
1.1根据文本字体大小设置文本的frame

CGSize size = [tmpLabel.text sizeWithAttributes: @{NSFontAttributeName:tmpLabel.font}];
        tmpLabel.frame = CGRectMake(xPos, yPos, viewWidth, size.height);

1.2也可以先让文本自适应

    _title = [[UILabel alloc] initWithFrame:CGRectZero];
    _title.numberOfLines = 1;
    _title.textColor = msg_title_color;
    _title.font = msg_title_font;
     _title.text = [attachment title];
    [_title sizeToFit];
    [self addSubview:_title];

2016年3月2日
1.文本居中

_summaryL.textAlignment = NSTextAlignmentCenter;

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UILabel

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