在开发中，经常可见字一个一个的弹出的情形，下面就使用NSThread来实现这种功能。
#import "ViewController.h"
@interface ViewController ()
@property (weak, nonatomic) IBOutletUILabel *titleLabel;
@property (copy , nonatomic)NSString *contentStr;
@end
@implementation ViewController
- (void)viewDidLoad {
[superviewDidLoad];
NSThread *thread = [[NSThreadalloc]initWithTarget:selfselector:@selector(animation)object:nil];
[thread start];
self.contentStr = @"我需要三件东西：爱情友谊和图书。然而这三者之间何其相通！炽热的爱情可以充实图书的内容，图书又是人们最忠实的朋友";
}
- (void)animation
{
for (NSInteger i =0; i < self.contentStr.length; i++)
{
[selfperformSelectorOnMainThread:@selector(refreshUIWithContentStr:)withObject:[self.contentStrsubstringWithRange:NSMakeRange(0, i+1)]waitUntilDone:YES];
[NSThreadsleepForTimeInterval:0.3];
}
}
- (void)refreshUIWithContentStr:(NSString *)contentStr
{
self.titleLabel.text = contentStr;
}
- (void)didReceiveMemoryWarning {
[superdidReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
