我正在尝试显示地名列表,包括使用 PFQueryTableViewController
的照片。它包含在来自 parse.com 的 ParseUI SDK 中
我已经设法显示图像。不幸的是,当我将 UIImageView 模式更改为 Aspect fill 时,图像变得比应有的大。
图片如下:
https://dl.dropboxusercontent.com/u/86529526/pic_normal.png https://dl.dropboxusercontent.com/u/86529526/pic_error.png
在pic_normal
中,你会看到两个单元格,有两个正常图像。
在 pic_error
中,您将看到第二个单元格被第一个单元格图像覆盖。
谁能帮我解决这个问题?我也把我的全部代码放在这里:
import UIKit
class TableViewController: PFQueryTableViewController, UISearchBarDelegate {
@IBOutlet var searchBar: UISearchBar!
// Initialise the PFQueryTable tableview
override init(style: UITableViewStyle, className: String!) {
super.init(style: style, className: className)
}
required init(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
// Configure the PFQueryTableView
self.pullToRefreshEnabled = true
self.paginationEnabled = false
}
// Define the query that will provide the data for the table view
override func queryForTable() -> PFQuery {
// Start the query object
var query = PFQuery(className: "Places")
// query with pointer
query.includeKey("mainPhoto")
// Add a where clause if there is a search criteria
if searchBar.text != "" {
query.whereKey("name", containsString: searchBar.text)
}
// Order the results
query.orderByAscending("name")
// Return the qwuery object
return query
}
//override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath, object: PFObject) -> PFTableViewCell? {
var cell = tableView.dequeueReusableCellWithIdentifier("CustomCell") as! CustomTableViewCell!
if cell == nil {
cell = CustomTableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier: "CustomCell")
}
// Extract values from the PFObject to display in the table cell
if let name = object["name"] as? String{
cell.name.text = name
}
// display initial image
var initialThumbnail = UIImage(named: "question")
cell.photo.image = initialThumbnail
// extract image from pointer
if let pointer = object["mainPhoto"] as? PFObject {
cell.detail.text = pointer["photoTitle"] as? String!
if let thumbnail = pointer["photo"] as? PFFile {
cell.photo.file = thumbnail
cell.photo.loadInBackground()
}
}
cell.sendSubviewToBack(cell.photo)
// return the cell
return cell
}
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using [segue destinationViewController].
var detailScene = segue.destinationViewController as! DetailViewController
// Pass the selected object to the destination view controller.
if let indexPath = self.tableView.indexPathForSelectedRow() {
let row = Int(indexPath.row)
detailScene.currentObject = objects[row] as? PFObject
}
}
override func viewDidLoad(){
super.viewDidLoad()
let tapGesture = UITapGestureRecognizer(target:self, action:Selector("hideKeyboard"))
tapGesture.cancelsTouchesInView = true
tableView.addGestureRecognizer(tapGesture)
}
func hideKeyboard(){
tableView.endEditing(true)
}
override func viewDidAppear(animated: Bool) {
// Refresh the table to ensure any data changes are displayed
tableView.reloadData()
// Delegate the search bar to this table view class
searchBar.delegate = self
}
func searchBarTextDidEndEditing(searchBar: UISearchBar) {
// Dismiss the keyboard
searchBar.resignFirstResponder()
// Force reload of table data
self.loadObjects()
}
func searchBarSearchButtonClicked(searchBar: UISearchBar) {
// Dismiss the keyboard
searchBar.resignFirstResponder()
// Force reload of table data
self.loadObjects()
}
func searchBarCancelButtonClicked(searchBar: UISearchBar) {
// Clear any search criteria
searchBar.text = ""
// Dismiss the keyboard
searchBar.resignFirstResponder()
// Force reload of table data
self.loadObjects()
}
}
最佳答案
将内容模式设置为Aspect Fill
,尝试将 clips to bounds 也设置为 true,原因是内容模式 aspect fill
不断填充图像的框架查看直到框架完全充满内容,同时保持宽高比
不变。在以图像保持宽高比填充容器的过程中,垂直或水平框架被完全填充,并且继续填充直到另一个(如果水平而不是垂直或反之亦然)部分被完全填充。因此,垂直或水平方向的第一个填充部分将超出边界,并且内容将在 ImageView 的框架之外可见。要剪切额外的内容,我们需要使用 imageView 的 clipsToBounds
属性设置为 true
cell.photo.contentMode = UIViewContentMode.ScaleAspectFill
cell.photo.clipsToBounds = true
关于ios - 为什么缩放以填充给出比 UIImageVIew 尺寸更大的图像? (使用 swift ),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/30073097/