随记(一)

1.视图位置

//将一个UIView显示在最前面只需要调用其父视图的 bringSubviewToFront（）//将一个UIView层推送到背后只需要调用其父视图sendSubviewToBack（）//插入到某一层[self.view insertSubview:toolBar aboveSubview:self.tableView];

2 单例传值

//存值 NSUserDefaults * user = [NSUserDefaults standardUserDefaults];   [user setObject:selStr forKey:@"selStr”];[user synchronize];//取值NSUserDefaults *defau = [NSUserDefaults standardUserDefaults];        [rightTextArray replaceObjectAtIndex:selIndex withObject:[defau objectForKey:@"selStr"]];//滚动tableView到指定节section[myTableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:button.tag] atScrollPosition:UITableViewScrollPositionTop animated:YES];

3 图片边框阴影

//阴影层：    CALayer *layer = [_titleImage layer];    layer.shadowOffset = CGSizeMake(0, 2);    layer.shadowRadius = 3.0;    layer.shadowColor = [UIColor blackColor].CGColor;    layer.shadowOpacity = 0.5;

4 cell入场动画

 CABasicAnimation *animation=[CABasicAnimation animationWithKeyPath:@"transform.scale"]; cell.layer.anchorPoint = CGPointMake(.5,.5); animation.fromValue = @0.0f; animation.toValue = @1.0f; animation.duration=1;//  animation.autoreverses=YES;//是否反转变为原来的属性值 //把animation添加到图层的layer中，便可以播放动画了。forKey指定要应用此动画的属性 [cell.layer addAnimation:animation forKey:@"scale"];

5 视图旋转动画
链接：http://zhangmingwei.iteye.com/blog/2101782

//旋转动画。[self.view.layer addAnimation:[self rotation:1 degree:180 direction:0 repeatCount:MAXFLOAT] forKey:nil];-(CABasicAnimation *)rotation:(float)dur degree:(float)degree direction:(int)direction repeatCount:(int)repeatCount{    CATransform3D rotationTransform = CATransform3DMakeRotation(degree, 0, 1, direction);    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform"];    animation.toValue = [NSValue valueWithCATransform3D:rotationTransform];    animation.duration  =  dur;    animation.autoreverses = NO;    animation.cumulative = NO;    animation.fillMode = kCAFillModeForwards;    animation.repeatCount = repeatCount;    animation.delegate = self;    return animation;}

6 计算文本高度

  CGSize constraint = CGSizeMake(self.frame.size.width, 20000);CGSize size = [@"哈哈哈哈哈哈哈哈" boundingRectWithSize:constraint options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:16]}context:nil].size;

7 cell刷新

//一个section刷新    NSIndexSet *indexSet=[[NSIndexSet alloc]initWithIndex:2];    [tableview reloadSections:indexSet withRowAnimation:UITableViewRowAnimationAutomatic];    //一个cell刷新    NSIndexPath *indexPath=[NSIndexPath indexPathForRow:3 inSection:0];    [tableView reloadRowsAtIndexPaths:[NSArray arrayWithObjects:indexPath,nil] withRowAnimation:UITableViewRowAnimationNone];

8 去掉UItableview headerview黏性(sticky)

//去掉UItableview headerview黏性(sticky) UITableViewStylePlain- (void)scrollViewDidScroll:(UIScrollView *)scrollView {    if (scrollView == groupTableView)    {        CGFloat sectionHeaderHeight = 50; //sectionHeaderHeight        if (scrollView.contentOffset.y<=sectionHeaderHeight&&scrollView.contentOffset.y>=0) {            scrollView.contentInset = UIEdgeInsetsMake(-scrollView.contentOffset.y, 0, 0, 0);        } else if (scrollView.contentOffset.y>=sectionHeaderHeight) {            scrollView.contentInset = UIEdgeInsetsMake(-sectionHeaderHeight, 0, 0, 0);        }    }}

9 摇一摇

#pragma mark - 生命周期函数  - (void)viewDidLoad {      [super viewDidLoad];      // 设置允许摇一摇功能      [UIApplication sharedApplication].applicationSupportsShakeToEdit = YES;      // 并让自己成为第一响应者      [self becomeFirstResponder];      return;  }  #pragma mark - 摇一摇相关方法  // 摇一摇开始摇动  - (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event {      NSLog(@"开始摇动");      return;  }  // 摇一摇取消摇动  - (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event {      NSLog(@"取消摇动");      return;  }  // 摇一摇摇动结束  - (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event {      if (event.subtype == UIEventSubtypeMotionShake) { // 判断是否是摇动结束          NSLog(@"摇动结束");      }      return;  }