NSMutableAttributedString的使用

 

#import "ViewController.h"

 

@interface ViewController ()

@property (nonatomic, strong) UILabel *lable;

@end

 

@implementation ViewController

 

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    

    self.lable = [[UILabel alloc] initWithFrame:CGRectMake(20, 100, 300, 200)];

    self.lable.numberOfLines = 0;

    _lable.text = [NSString stringWithFormat:@"丁凱樂是《快樂星球1》[1-2]  主角。在《快樂星球2》中客串。丁凱樂（小名樂樂）是現實生活中陽光小學四年級的學生，像中國大多數10歲左右的孩子同樣"];

    _lable.textAlignment = NSTextAlignmentLeft;

    _lable.font = [UIFont systemFontOfSize:14];

    [self.view addSubview:_lable];

    //設置行間距爲9

    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];

    [paragraphStyle setLineSpacing:9];

    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:_lable.text];

    [attributedString addAttributes:@{NSParagraphStyleAttributeName:paragraphStyle} range:NSMakeRange(0, [_lable.text length])];

    _lable.attributedText = attributedString;

    

    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];

    button.frame = CGRectMake(20, 500, 100, 50);

    button.backgroundColor = [UIColor redColor];

    [button addTarget:self action:@selector(click) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:button];

 

}

// 注：lable上的文字發生改變，必須從新設置行間距，不然改變後的文字的行間距依然沒有變

-(void)click

{

    self.lable.text = @"丁凱樂是《快樂星球1》[1-2]  主角。在《快樂星球2》中客串。丁凱樂（小名樂樂）是現實生活中陽光小學四年級的學生，像中國大多數10歲左右的孩子同樣，他的生活平靜、普通並且循序漸進。可是因爲他的性格內向、膽小怕事，在學校他常常被班裏幾個調皮的同窗金剛、胖哥和小九九欺負，樂樂惹不起他們，只好忍氣吞聲。";

    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];

    [paragraphStyle setLineSpacing:9];

    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:_lable.text];

    [attributedString addAttributes:@{NSParagraphStyleAttributeName:paragraphStyle} range:NSMakeRange(0, [_lable.text length])];

    _lable.attributedText = attributedString;

 

   }