喷枪打字

#import "ViewController.h"

@interface ViewController ()

@property (strong,nonatomic) UILabel *contentLabel;

@property (copy , nonatomic)NSString *contentStr;

@end

@implementation ViewController

- (void)viewDidLoad {

    [superviewDidLoad];

    

    

    NSThread *thread = [[NSThreadalloc]initWithTarget:selfselector:@selector(animationLabel)object:nil];

    [thread start];

    self.contentStr =@"九层之台，起于垒土，千里之行，始于足下/积土成山，风雨兴焉，积水成渊，蛟龙生焉/不积小流无以成江海，不积跬步，无以至千里/合抱之木，生于毫末，九层之台，起于垒土。(任选其一)不讲礼、不守则等失范行为的解决并非一朝一夕之事;只有个人践行礼貌礼节才能让社会人人之间和谐相处;只有政府强制约束失范行为才能如虎添翼社会稳定;只有强化阅读、提升教育才能提升社会道德力量，真正实现政治清明、社会善治、民众安居的美好生活。";

    

    

    

    

    self.contentLabel = [[UILabelalloc]initWithFrame:CGRectMake(10,100, [UIScreenmainScreen].bounds.size.width -20, 400)];

    [self.viewaddSubview:self.contentLabel];

    self.contentLabel.textColor = [UIColorpurpleColor];

    self.contentLabel.numberOfLines =0;

}

- (void)animationLabel

{

    for (NSInteger i =0; i < self.contentStr.length; i++)

    {

        [selfperformSelectorOnMainThread:@selector(refreshUIWithContentStr:)withObject:[self.contentStrsubstringWithRange:NSMakeRange(0, i+1)]waitUntilDone:YES];

        [NSThread sleepForTimeInterval:0.1];

    }

}

- (void)refreshUIWithContentStr:(NSString *)contentStr

{

    self.contentLabel.text = contentStr;

}

@end