KentarouKanno/if.md

## if.md

      
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              if.md
            
          
    if

let value = 10 

if value == 10 { 
    print("value = 10")
} 
★ if - let
let intValue: Int? = 5
var result: Int = 0

if let intValue = intValue {
    // intValue Unwrapped
    result = intValue + 10
}

------------------------------

let urlString = "https://sample.com/profile_images/image/imagephoto.png"

// url,data,image全てがOptinalで無い場合
if let url = NSURL(string: urlString), data = NSData(contentsOfURL: url), image = UIImage(data: data) {
    UIImageView(image: image)
}

------------------------------

let urlString = "https://sample.com/profile_images/image/imagephoto.png"

// where文の後に更にOptional Bindingをする場合
if let url = NSURL(string: urlString) where url.pathExtension == "png", let data = NSData(contentsOfURL: url), image = UIImage(data: data) {
    UIImageView(image: image)
}