如何快速在 NSUserDefaults 中保存颜色? [英] How to save a color in NSUserDefaults in swift?
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问题描述
我在 NSUserDefaults 中保存颜色时遇到了一点问题.在objective-c 中很容易:
I have a litle problem with saving a color in NSUserDefaults . In objective-c is easy :
-(NSColor *)colorForKey:(NSString *)key{
NSData *data;
NSColor *color;
data = [[NSUserDefaults standardUserDefaults] objectForKey:key];
color= [NSUnarchiver unarchiveObjectWithData:data];
if( ! [color isKindOfClass:[NSColor class]] ){
color = nil;
}
return color;
}
-(void)setColor:(NSColor *)color forKey:(NSString *)key{
NSData *data = [NSArchiver archivedDataWithRootObject:color];
[[NSUserDefaults standardUserDefaults] setObject:data forKey:key];
}
上面的代码在objective-c 中工作正常,但是当我尝试在swift 中编写相同的代码时,我在从NSUserDefaults 读取颜色时收到错误.
The above code works fine in objective-c, but when i try to write same code in swift, I receive errors at reading color from NSUserDefaults.
func saveColorForKey (color:NSColor , key:NSString ) {
var data:NSData = NSData()
data = NSArchiver.archivedDataWithRootObject(color)
NSUserDefaults.standardUserDefaults().setObject(data, forKey: key)
}
func colorForKey(key:NSString) -> NSColor{
var data: AnyObject? = NSUserDefaults.standardUserDefaults().objectForKey(key)
var color: AnyObject? = NSUnarchiver.unarchiveObjectWithData(data? as NSData)
return color as NSColor
}
谢谢,对不起我的英语!
Thanks , and sorry for my english !
推荐答案
对于 Objective C
像这样的地方.
NSData *colorData = [NSKeyedArchiver archivedDataWithRootObject:color];
[[NSUserDefaults standardUserDefaults] setObject:colorData forKey:@"myColor"];
像这样回来.
NSData *colorData = [[NSUserDefaults standardUserDefaults] objectForKey:@"myColor"];
UIColor *color = [NSKeyedUnarchiver unarchiveObjectWithData:colorData];
对于 Swift
这样设置
var userSelectedColor : NSData? = (NSUserDefaults.standardUserDefaults().objectForKey("UserSelectedColor") as? NSData)
if (userSelectedColor != nil) {
var colorToSetAsDefault : UIColor = UIColor.redColor()
var data : NSData = NSKeyedArchiver.archivedDataWithRootObject(colorToSetAsDefault)
NSUserDefaults.standardUserDefaults().setObject(data, forKey: "UserSelectedColor")
NSUserDefaults.standardUserDefaults().synchronize()
println("SET DEFAULT USER COLOR TO RED")
}
就这样.
if let userSelectedColorData = NSUserDefaults.standardUserDefaults().objectForKey("UserSelectedColor") as? NSData {
if let userSelectedColor = NSKeyedUnarchiver.unarchiveObjectWithData(userSelectedColorData) as? UIColor {
println(userSelectedColor)
}
}
对于 Swift 4.2
像这样的地方.
let colorToSetAsDefault : UIColor = UIColor.red
let data : Data = NSKeyedArchiver.archivedData(withRootObject: colorToSetAsDefault) as Data
UserDefaults.standard.set(data, forKey: "UserSelectedColor")
UserDefaults.standard.synchronize()
print("SET DEFAULT USER COLOR TO RED")
像这样回来.
if let userSelectedColorData = UserDefaults.standard.object(forKey: "UserSelectedColor") as? Data {
if let userSelectedColor = NSKeyedUnarchiver.unarchiveObject(with:userSelectedColorData as Data) as? UIColor {
print(userSelectedColor)
}
}
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