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import UIKit | |
func sizeHeightWithText(labelText: String, | |
fontSize: CGFloat, | |
textAttributes: [String : AnyObject]) -> CGRect { | |
return labelText.boundingRect( | |
with: CGSize(width:fontSize, height:480), | |
options: NSStringDrawingOptions.usesLineFragmentOrigin, | |
attributes: textAttributes, context: nil) |
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let fontSize: CGFloat = 22.0 | |
func sizeHeightWithText(labelText: NSString, | |
fontSize: CGFloat, | |
textAttributes: [String : Any]) -> CGRect { | |
return labelText.boundingRect( | |
with: CGSize(width:fontSize, height:480), | |
options: NSStringDrawingOptions.usesLineFragmentOrigin, | |
attributes: textAttributes, context: nil) |
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func swapTwoValues<Joseph>(_ a: inout Joseph, _ b: inout Joseph) { | |
let temporaryA = a | |
a = b | |
b = temporaryA | |
} | |
var someInt = 3 | |
var anotherInt = 107 | |
swapTwoValues(&someInt, &anotherInt) | |
print("someInt 现在是\(someInt),anotherInt 现在是 \(anotherInt)") |
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func swapTwoInts(_ a: inout Int, _ b: inout Int) { | |
let temporaryA = a | |
a = b | |
b = temporaryA | |
} | |
var someInt = 3 | |
var anotherInt = 107 | |
swapTwoInts(&someInt, &anotherInt) | |
print("someInt 现在是 \(someInt),anotherInt 现在是 \(anotherInt)") |
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protocol ManagedObjectContextSettable: class { | |
var managedObjectContext: NSManagedObjectContext! { get set } | |
} |
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let nickName: String? = nil | |
let fullName: String = "John Appleseed" | |
let informalGreeting = "Hi \(nickName ?? fullName)" |
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func objectAtIndexPath(indexPath: NSIndexPath) -> Object { | |
guard let result = fetchedResultsController.objectAtIndexPath(indexPath) | |
as? Object else | |
{ | |
fatalError("Unexpected object at \(indexPath)") | |
} | |
return result | |
} |
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-(void) callMe { | |
//... | |
} | |
-(void) callMeWithParam:(id)obj { | |
//... | |
} | |
SEL someMethod = @selector(callMe); | |
SEL anotherMethod = @selector(callMeWithParam:); |
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func addTo(_ adder: Int) -> (Int) -> Int { | |
return { | |
num in | |
return num + adder | |
} | |
} | |
let addTwo = addTo(2) //addTwo:Int -> Int | |
let result = addTwo(6) //result = 8 |
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override func didReceiveMemoryWarning() { | |
super.didReceiveMemoryWarning() | |
// 在这里销毁所有可以被重建的资源 | |
} |