【代码笔记】获得富文本设置以后的文字高度

#import <UIKit/UIKit.h>

@interface RootViewController : UIViewController

@end

#import "RootViewController.h"

@interface RootViewController ()

@end

@implementation RootViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    //初始化界面
    [self addView];
   
}
#pragma -mark -functions
//初始化界面
-(void)addView
{
    //文字
    UILabel *dataLabel = [[UILabel alloc] init];
    dataLabel.backgroundColor = [UIColor orangeColor];
    dataLabel.text = @"我是文字文字文字文字文字文字文字文字文字文字文字11111111111111111111111111111111111";
    dataLabel.textColor = [UIColor redColor];
    dataLabel.font = [UIFont fontWithName:@"Arial" size:14];
    dataLabel.numberOfLines = 0;
    [self.view addSubview:dataLabel];
    
    //富文本设置文字行间距
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init];
    paragraphStyle.lineSpacing = 4;
    
    NSDictionary *attributes = @{ NSFontAttributeName:[UIFont systemFontOfSize:14], NSParagraphStyleAttributeName:paragraphStyle};
    dataLabel.attributedText = [[NSAttributedString alloc]initWithString:dataLabel.text attributes:attributes];
    
    //获取设置文本间距以后的高度
    CGRect fram = [dataLabel.attributedText boundingRectWithSize:CGSizeMake(210, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin context:nil];
    
    dataLabel.frame=CGRectMake(50, 100, 210, fram.size.height);
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}