iOS10个实用小技巧（总有你不知道的和你会用到的）

6、给webView添加头视图

UIView*webBrowserView=self.webView.scrollView.subviews[0];//拿到webView的webBrowserView
self.backHeadImageView=[[UIImageViewalloc]initWithFrame:CGRectMake(0,0,kScreenWidth,kScreenWidth*2/3.0)];
[_backHeadImageViewsd_setImageWithURL:[NSURLURLWithString:self.imageUrl]placeholderImage:[UIImageimageNamed:@"placeholderImage"]];
[self.webViewinsertSubview:_backHeadImageViewbelowSubview:self.webView.scrollView];
//把backHeadImageView插入到webView的scrollView下面
CGRectframe=self.webBrowserView.frame;
frame.origin.y=CGRectGetMaxY(_backHeadImageView.frame);
self.webBrowserView.frame=frame;
//更改webBrowserView的frame向下移backHeadImageView的高度，使其可见

7、模态跳转的动画设置

DetailViewController*detailVC=[[DetailViewControlleralloc]init];
//UIModalTransitionStyleFlipHorizontal翻转
//UIModalTransitionStyleCoverVertical底部滑出
//UIModalTransitionStyleCrossDissolve渐显
//UIModalTransitionStylePartialCurl翻页
detailVC.modalTransitionStyle=UIModalTransitionStylePartialCurl;
[selfpresentViewController:detailVCanimated:YEScompletion:nil];

8、图片处理只拿到图片的一部分

UIImage*image=[UIImageimageNamed:filename];
CGImageRefimageRef=image.CGImage;
CGRectrect=CGRectMake(origin.x,origin.y,size.width,size.height);
//这里的宽高是相对于图片的真实大小
//比如你的图片是400x400的那么（0，0，400，400）就是图片的全尺寸，想取哪一部分就设置相应坐标即可
CGImageRefimageRefRect=CGImageCreateWithImageInRect(imageRef,rect);
UIImage*imageRect=[[UIImagealloc]initWithCGImage:imageRefRect];

9、给UIView设置图片

UIImage*image=[UIImageimageNamed:@"playing"];
_layerView.layer.contents=(__bridgeid)image.CGImage;
_layerView.layer.contentsCenter=CGRectMake(0.25,0.25,0.5,0.5);
//同样可以设置显示的图片范围
//不过此处略有不同，这里的四个值均为0-1之间；对应的依然是写x,y,widt,height

10、给TableView或者CollectionView的cell添加简单动画，像这样

-(void)tableView:(UITableView*)tableViewwillDisplayCell:(UITableViewCell*)cellforRowAtIndexPath:(NSIndexPath*)indexPath{
NSArray*array=tableView.indexPathsForVisibleRows;
NSIndexPath*firstIndexPath=array[0];

//设置anchorPoint
cell.layer.anchorPoint=CGPointMake(0,0.5);
//为了防止cell视图移动，重新把cell放回原来的位置
cell.layer.position=CGPointMake(0,cell.layer.position.y);

//设置cell按照z轴旋转90度，注意是弧度
if(firstIndexPath.row<indexPath.row){
cell.layer.transform=CATransform3DMakeRotation(M_PI_2,0,0,1.0);
}else{
cell.layer.transform=CATransform3DMakeRotation(-M_PI_2,0,0,1.0);
}

cell.alpha=0.0;

[UIViewanimateWithDuration:1animations:^{
cell.layer.transform=CATransform3DIdentity;
cell.alpha=1.0;
}];
}
-(void)collectionView:(UICollectionView*)collectionViewwillDisplayCell:(UICollectionViewCell*)cellforItemAtIndexPath:(NSIndexPath*)indexPath{

if(indexPath.row%2!=0){
cell.transform=CGAffineTransformTranslate(cell.transform,kScreenWidth/2,0);
}else{
cell.transform=CGAffineTransformTranslate(cell.transform,-kScreenWidth/2,0);
}
cell.alpha=0.0;
[UIViewanimateWithDuration:0.7animations:^{
cell.transform=CGAffineTransformIdentity;
cell.alpha=1.0;
}completion:^(BOOLfinished){

}];
}