就算在牛逼的大神也不一定有好的記性，在開發中有時候一些小點就是想不起來。這里總結下最近遇到的，不定期更新--
1、 關閉隱式動畫
開發中有時候會遇到莫名其妙不希望出現的動畫，肯定是系統的隱式動畫再起作用，layer層屬性默認是帶動畫的 可以用下面的方式禁掉
CATransaction.begin()
CATransaction.setDisableActions(true) // 關閉動畫
//你的代碼
CATransaction.commit()
2、文件存取
在開發中有時候要本地緩存一些文件文件只能放在document文件夾下才能存取
下面是獲取文件夾目錄方式
let paths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)
let documentDirectory = paths[0]
后面加自己設定的目錄就行了
下面放下我寫的文件讀取的方法 傳入key folder等 自己摸索吧。
//MARK: -從文件獲取用戶信息
static func getUserFromDisk(key:String,folder:String)->AnyObject?{
//反歸檔 獲取
let fileManager = NSFileManager.defaultManager()
if fileManager.fileExistsAtPath(folder){
let mdata = NSMutableData(contentsOfFile:folder )
let unArchiver = NSKeyedUnarchiver(forReadingWithData: mdata!)
let u = unArchiver.decodeObjectForKey(key)
return u
}
return nil
}
static func saveModelToFile(key:String,value:AnyObject?,folder:String){
let data = NSMutableData()
var keyArchiver:NSKeyedArchiver!
keyArchiver = NSKeyedArchiver(forWritingWithMutableData: data)
keyArchiver.encodeObject(value, forKey: key)
keyArchiver.finishEncoding() //歸檔完畢
do {
try data.writeToFile(folder, options: NSDataWritingOptions.DataWritingAtomic)
}catch let err{
print("err:\(err)")
}
}
3、http圖片或者網絡不能訪問
http開頭蘋果認為不是安全的連接，要手動配置下，在plist里加上如下代碼
<key>NSAppTransportSecurity</key>
<dict>
<key>NSAllowsArbitraryLoads</key>
<true/>
</dict>
4、判斷兩個矩形是否相交
CGRectIntersection(<#T##r1: CGRect##CGRect#>, <#T##r2: CGRect##CGRect#>)
5、解決添加tap手勢后點擊cell無響應
實現UIGestureRecognizerDelegate協議下面的方法
func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldReceiveTouch touch: UITouch) -> Bool {
if NSStringFromClass(touch.view!.classForCoder) == "UITableViewCellContentView"{
return false
}
return true
}
5、tableView自動布局高度自適應
至于怎么約束，不再這里討論
tableView.estimatedRowHeight = 50 //預估高度
tableView.rowHeight = UITableViewAutomaticDimension
6、讀取plist文件
let plistPath = NSBundle.mainBundle().pathForResource("SampleData", ofType: "plist")
if let plistPath=plistPath{
let arr = NSArray(contentsOfFile: plistPath)
print(arr)
}
7、tableView不顯示多余行，不顯示分割線，從xib中注冊
tableView.separatorStyle = UITableViewCellSeparatorStyle.None
tableView.tableFooterView = UIView(frame: CGRectZero)
tableView.registerNib(UINib(nibName: "homePageCell", bundle: NSBundle.mainBundle()), forCellReuseIdentifier: "cell") //從nib 注冊cell
8、自定義導航欄的一些屬性
//自定義一些導航欄的顏色
UINavigationBar.appearance().barTintColor = UIColor(red: 231.0/255.0, green: 95.0/255.0, blue:
53.0/255.0, alpha: 0.3)
UINavigationBar.appearance().tintColor = UIColor.whiteColor()
if let barFont = UIFont(name: "AvenirNextCondensed-DemiBold",
size: 22.0) {
UINavigationBar.appearance().titleTextAttributes =
[NSForegroundColorAttributeName:UIColor.whiteColor(),
NSFontAttributeName:barFont]
}
self.navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: .Plain, target: nil, action: nil) //返回按鈕位空
9 、自定義tabbar的一些屬性
UIBarButtonItem.appearance().tintColor = UIColor(red: 235.0/255.0, green: 73.0/255.0, blue:
27.0/255.0, alpha: 1.0)
UIToolbar.appearance().barTintColor = UIColor(red: 237.0/255.0, green: 240.0/255.0, blue:
243.0/255.0, alpha: 0.5)
10、UIImagePickerController 選擇圖片的簡單實用（單選）
//如果相冊可用
if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.PhotoLibrary){
let imagePicker = UIImagePickerController()
imagePicker.allowsEditing = false
imagePicker.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
self.presentViewController(imagePicker, animated: true, completion: nil)
}
11、擴展UIImage的兩個方法
extension UIImage{
//圖像比例縮放
func scaleImage(img:UIImage,scaleSize:CGFloat)->UIImage{
UIGraphicsBeginImageContext(CGSizeMake(img.size.width * scaleSize, img.size.height * scaleSize))
img.drawInRect(CGRectMake(0, 0, img.size.width * scaleSize, img.size.height * scaleSize))
let scaledImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return scaledImage
}
//自定長寬
func reSizeImage( toSize:CGSize)->UIImage{
UIGraphicsBeginImageContext(CGSizeMake(toSize.width, toSize.height));
self.drawInRect(CGRectMake(0, 0, toSize.width, toSize.height))
let reSizeImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return reSizeImage;
}
}
12、空數據顯示方案
import UIKit
extension UITableView{
//MARK: -空table的解決方案
func tableViewMsgWhenEmpty(message:String,rowCount:Int){
if rowCount == 0{
//沒有數據
let messageLabel = UILabel()
// Display a message when the table is empty
messageLabel.text = message;
messageLabel.textColor = MAIN_COLOR
messageLabel.numberOfLines = 0
messageLabel.textAlignment = NSTextAlignment.Center
messageLabel.font = UIFont.systemFontOfSize(17)
messageLabel.sizeToFit()
self.backgroundView = messageLabel
messageLabel.frame = CGRectMake(0, 0, self.frame.width, self.frame.height)
messageLabel.sizeToFit()
self.separatorStyle = UITableViewCellSeparatorStyle.None
}else{
//有數據
self.backgroundView = nil
self.separatorStyle = UITableViewCellSeparatorStyle.SingleLine
}
}
}
13、上傳照片的時候要先壓縮下，不然一個圖片幾M 上傳到服務器太浪費資源
let data = UIImageJPEGRepresentation(img,0.5)
第一個參數是UIImage對象 第二個是壓縮比率 ，應該不會失真
14、對象的序列化與反序列化
class Tag: NSObject,NSCoding {
var id:NSNumber?
var name:String?
override init() {
}
//MARK: -序列化
func encodeWithCoder(aCoder: NSCoder) {
aCoder.encodeObject(self.name, forKey: "name")
aCoder.encodeObject(self.id, forKey: "id")
}
//MARK: -反序列化
required init?(coder aDecoder: NSCoder) {
self.id = aDecoder.decodeObjectForKey("id") as? NSNumber
self.name = aDecoder.decodeObjectForKey("name") as? String
}
}
15、跳轉明細頁的時候隱藏tabbar
let followsVC = FollowsViewController()
followsVC.hidesBottomBarWhenPushed = true
self.navigationController?.pushViewController(followsVC, animated: true)
16、iOS8以上UITableCell左邊不留空，一點空都沒有哦
cell.preservesSuperviewLayoutMargins = false
cell.layoutMargins = UIEdgeInsetsZero
17、Segue相關的幾個方法
//用來判斷是否需要跳轉
override func shouldPerformSegueWithIdentifier(identifier: String, sender: AnyObject?) -> Bool {
if xxxxx == nil{
return false
}
return true
}
//可以用代碼 直接控制跳轉
override func performSegueWithIdentifier(identifier: String, sender: AnyObject?) {
}
//是點擊界面上的按鈕 根據你綁定的跳轉界面進行跳轉
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
}
18、http 請求需要在plist添加如下代碼塊
<key>NSAppTransportSecurity</key>
<dict>
<key>NSAllowsArbitraryLoads</key>
<true/>
</dict>
19、DM5加密
extension String{
//MARK: -字符串替換
func myreplace(oldStr:String,newStr:String)->String{
return self.stringByReplacingOccurrencesOfString(oldStr, withString: newStr, options: NSStringCompareOptions.NumericSearch, range: nil)
}
//MARK: -MD5算法
func md5() ->String!{
let str = self.cStringUsingEncoding(NSUTF8StringEncoding)
let strLen = CUnsignedInt(self.lengthOfBytesUsingEncoding(NSUTF8StringEncoding))
let digestLen = Int(CC_MD5_DIGEST_LENGTH)
let result = UnsafeMutablePointer<CUnsignedChar>.alloc(digestLen)
CC_MD5(str!, strLen, result)
let hash = NSMutableString()
for i in 0 ..< digestLen {
hash.appendFormat("%02x", result[i])
}
result.destroy()
return String(format: hash as String)
}
}
