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实现原理比较简单,这里不做过多介绍.
#import "ViewController.h" @interface ViewController () @property (weak, nonatomic) IBOutlet UILabel *titleLabel; @property (copy , nonatomic)NSString *contentStr; @end
- (void)viewDidLoad { [super viewDidLoad]; NSThread *thread = [[NSThread alloc]initWithTarget:self selector:@selector(animationLabel) object:nil]; [thread start]; self.contentStr = @"人生最宝贵的是生命,生命属于人只有一次。一个人的生命应当这样度过:当他回忆往事的时候,他不致因虚度年华而悔恨,也不致因碌碌无为而羞愧;在临死的时候,他能够说:“我的整个生命和全部精力,都已献给世界上最壮丽的事业——为人类的解放而斗争。”"; }
- (void)animationLabel { for (NSInteger i = 0; i < self.contentStr.length; i++) { [self performSelectorOnMainThread:@selector(refreshUIWithContentStr:) withObject:[self.contentStr substringWithRange:NSMakeRange(0, i+1)] waitUntilDone:YES]; [NSThread sleepForTimeInterval:0.3]; } }
- (void)refreshUIWithContentStr:(NSString *)contentStr { self.titleLabel.text = contentStr; }
最终效果:
来自:http://blog.csdn.net/qq_31810357/article/details/49486509