@@ -10,17 +10,30 @@ import UIKit
1010import ImageIO
1111
1212extension UIImage {
13-
14- public class func animatedImageWithData( data: NSData ) -> UIImage ? {
15- guard let source = CGImageSourceCreateWithData ( data, nil ) else { return nil }
16-
13+
14+ public class func gifWithData( data: NSData ) -> UIImage ? {
15+ guard let source = CGImageSourceCreateWithData ( data, nil ) else {
16+ print ( " SwiftGif: Source for the image does not exist " )
17+ return nil
18+ }
1719 return UIImage . animatedImageWithSource ( source)
1820 }
19-
20- class func delayForImageAtIndex( index: Int , source: CGImageSource ! )
21- -> Double {
21+
22+ public class func gifWithName( name: String ) -> UIImage ? {
23+ guard let bundleURL = NSBundle . mainBundle ( ) . URLForResource ( name, withExtension: " gif " ) else {
24+ print ( " SwiftGif: This image named \" \( name) \" does not exist " )
25+ return nil
26+ }
27+ guard let imageData = NSData ( contentsOfURL: bundleURL) else {
28+ print ( " SwiftGif: Cannot turn image named \" \( name) \" into NSData " )
29+ return nil
30+ }
31+ return gifWithData ( imageData)
32+ }
33+
34+ class func delayForImageAtIndex( index: Int , source: CGImageSource ! ) -> Double {
2235 var delay = 0.1
23-
36+
2437 // Get dictionaries
2538 let cfProperties = CGImageSourceCopyPropertiesAtIndex ( source, index, nil )
2639 let gifProperties : CFDictionaryRef = unsafeBitCast (
@@ -37,17 +50,16 @@ extension UIImage {
3750 delayObject = unsafeBitCast ( CFDictionaryGetValue ( gifProperties,
3851 unsafeAddressOf ( kCGImagePropertyGIFDelayTime) ) , AnyObject . self)
3952 }
40-
53+
4154 delay = delayObject as! Double
42-
55+
4356 if delay < 0.1 {
4457 delay = 0.1 // Make sure they're not too fast
4558 }
46-
47-
59+
4860 return delay
4961 }
50-
62+
5163 class func gcdForPair( var a: Int ? , var _ b: Int ? ) -> Int {
5264 // Check if one of them is nil
5365 if b == nil || a == nil {
@@ -59,19 +71,19 @@ extension UIImage {
5971 return 0
6072 }
6173 }
62-
74+
6375 // Swap for modulo
6476 if a < b {
6577 let c = a
6678 a = b
6779 b = c
6880 }
69-
81+
7082 // Get greatest common divisor
7183 var rest : Int
7284 while true {
7385 rest = a! % b!
74-
86+
7587 if rest == 0 {
7688 return b! // Found it
7789 } else {
@@ -80,70 +92,70 @@ extension UIImage {
8092 }
8193 }
8294 }
83-
95+
8496 class func gcdForArray( array: Array < Int > ) -> Int {
8597 if array. isEmpty {
8698 return 1
8799 }
88-
100+
89101 var gcd = array [ 0 ]
90-
102+
91103 for val in array {
92104 gcd = UIImage . gcdForPair ( val, gcd)
93105 }
94-
106+
95107 return gcd
96108 }
97-
98- public class func animatedImageWithSource( source: CGImageSource ) -> UIImage ? {
109+
110+ class func animatedImageWithSource( source: CGImageSource ) -> UIImage ? {
99111 let count = CGImageSourceGetCount ( source)
100112 var images = [ CGImageRef] ( )
101113 var delays = [ Int] ( )
102-
114+
103115 // Fill arrays
104116 for i in 0 ..< count {
105117 // Add image
106118 if let image = CGImageSourceCreateImageAtIndex ( source, i, nil ) {
107119 images. append ( image)
108120 }
109-
121+
110122 // At it's delay in cs
111123 let delaySeconds = UIImage . delayForImageAtIndex ( Int ( i) ,
112124 source: source)
113125 delays. append ( Int ( delaySeconds * 1000.0 ) ) // Seconds to ms
114126 }
115-
127+
116128 // Calculate full duration
117129 let duration : Int = {
118130 var sum = 0
119-
131+
120132 for val : Int in delays {
121133 sum += val
122134 }
123-
135+
124136 return sum
125137 } ( )
126-
138+
127139 // Get frames
128140 let gcd = gcdForArray ( delays)
129141 var frames = [ UIImage] ( )
130-
142+
131143 var frame : UIImage
132144 var frameCount : Int
133145 for i in 0 ..< count {
134146 frame = UIImage ( CGImage: images [ Int ( i) ] )
135147 frameCount = Int ( delays [ Int ( i) ] / gcd)
136-
148+
137149 for _ in 0 ..< frameCount {
138150 frames. append ( frame)
139151 }
140152 }
141-
153+
142154 // Heyhey
143155 let animation = UIImage . animatedImageWithImages ( frames,
144156 duration: Double ( duration) / 1000.0 )
145-
157+
146158 return animation
147159 }
148-
160+
149161}
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