bug小结

aspect fill：拉伸变形
aspect fit fill:裁切拉伸居中
aspect fit：裁切

btn setimage
btn setbackgroundimage

• 两个异步的网络请求，他们之间有公共的变量需要访问，而出现了线程安全问题，比如分页的变量，比如存储的类型变量
• identify 回归原处

动画

• 移除动画
• 重新归位

-(void)beginAnimationView
{
    self.guideView.hidden = NO;
    [self.guideView.layer removeAllAnimations];
    _guideView.frame = CGRectMake(0, kScreenHeight - tabHeight - _guideView.frame.size.height - 10, kScreenWidth, _guideView.frame.size.height);
    [UIView beginAnimations:nil context:nil];
    //设定动画持续时间
    [UIView setAnimationDuration:0.8f];
    [UIView setAnimationRepeatAutoreverses:YES];
    [UIView setAnimationRepeatCount:10000];
    [UIView setAnimationCurve:UIViewAnimationCurveLinear];
    //动画的内容
    _guideView.frame = CGRectMake(_guideView.frame.origin.x, kScreenHeight - tabHeight - _guideView.frame.size.height, _guideView.frame.size.width, _guideView.frame.size.height);
    //动画结束
    [UIView commitAnimations];
}