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SweetParty/Expand/Category/UIImage+Additions.m

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+//
+//  UIImage+Additions.m
+//  GoldCow
+//
+//  Created by haiwei on 15/6/1.
+//  Copyright (c) 2015年 ddsfsdfsd. All rights reserved.
+//
+
+#import "UIImage+Additions.h"
+
+#import <ImageIO/ImageIO.h>
+
+@implementation UIImage (Additions)
+
++ (UIImage *)imageWithColor:(UIColor *)color withSize:(CGSize)size {
+    
+    CGRect rect = CGRectMake(0.0f, 0.0f, size.width, size.height);
+    UIGraphicsBeginImageContext(size);
+    CGContextRef context = UIGraphicsGetCurrentContext();
+    
+    CGContextSetFillColorWithColor(context, [color CGColor]);
+    CGContextFillRect(context, rect);
+    
+    UIImage * image = UIGraphicsGetImageFromCurrentImageContext();
+    UIGraphicsEndImageContext();
+    
+    return image;
+}
+
++ (UIImage *)imageWithColor:(UIColor *)color {
+    return [UIImage imageWithColor:color withSize:CGSizeMake(1, 1)];
+}
+
+
+- (UIImage *)imageByCropToRect:(CGRect)rect {
+    rect.origin.x *= self.scale;
+    rect.origin.y *= self.scale;
+    rect.size.width *= self.scale;
+    rect.size.height *= self.scale;
+    if (rect.size.width <= 0 || rect.size.height <= 0) return nil;
+    CGImageRef imageRef = CGImageCreateWithImageInRect(self.CGImage, rect);
+    UIImage *image = [UIImage imageWithCGImage:imageRef scale:self.scale orientation:self.imageOrientation];
+    CGImageRelease(imageRef);
+    return image;
+}
+
++ (UIImage *)sd_animatedGIFNamed:(NSString *)name {
+    CGFloat scale = [UIScreen mainScreen].scale;
+    
+    if (scale > 1.0f) {
+        NSString *retinaPath = [[NSBundle mainBundle] pathForResource:[name stringByAppendingString:@"@2x"] ofType:@"gif"];
+        
+        NSData *data = [NSData dataWithContentsOfFile:retinaPath];
+        
+        if (data) {
+            return [UIImage animatedGIFWithData:data];
+        }
+        
+        NSString *path = [[NSBundle mainBundle] pathForResource:name ofType:@"gif"];
+        
+        data = [NSData dataWithContentsOfFile:path];
+        
+        if (data) {
+            return [UIImage animatedGIFWithData:data];
+        }
+        
+        return [UIImage imageNamed:name];
+    }
+    else {
+        NSString *path = [[NSBundle mainBundle] pathForResource:name ofType:@"gif"];
+        
+        NSData *data = [NSData dataWithContentsOfFile:path];
+        
+        if (data) {
+            return [UIImage animatedGIFWithData:data];
+        }
+        
+        return [UIImage imageNamed:name];
+    }
+}
+
++ (UIImage *)animatedGIFWithData:(NSData *)data {
+    if (!data) {
+        return nil;
+    }
+    
+    //获取数据源
+    CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL);
+    
+    // 获取图片数量(如果传入的是gif图的二进制，那么获取的是图片帧数)
+    size_t count = CGImageSourceGetCount(source);
+    
+    UIImage *animatedImage;
+    
+    if (count <= 1) {
+        animatedImage = [[UIImage alloc] initWithData:data];
+    }
+    else {
+        NSMutableArray *images = [NSMutableArray array];
+        
+        NSTimeInterval duration = 0.0f;
+        
+        for (size_t i = 0; i < count; i++) {
+            CGImageRef image = CGImageSourceCreateImageAtIndex(source, i, NULL);
+            
+            duration += [UIImage frameDurationAtIndex:i source:source];
+            
+            [images addObject:[UIImage imageWithCGImage:image scale:[UIScreen mainScreen].scale orientation:UIImageOrientationUp]];
+            
+            CGImageRelease(image);
+        }
+        // 如果上面的计算播放时间方法没有成功，就按照下面方法计算
+        // 计算一次播放的总时间：每张图播放1/10秒 * 图片总数
+        if (!duration) {
+            duration = (1.0f / 10.0f) * count;
+        }
+        
+        animatedImage = [UIImage animatedImageWithImages:images duration:duration];
+    }
+    
+    CFRelease(source);
+    
+    return animatedImage;
+}
+
++ (float)frameDurationAtIndex:(NSUInteger)index source:(CGImageSourceRef)source {
+    float frameDuration = 0.1f;
+    // 获取这一帧的属性字典
+    CFDictionaryRef cfFrameProperties = CGImageSourceCopyPropertiesAtIndex(source, index, nil);
+    NSDictionary *frameProperties = (__bridge NSDictionary *)cfFrameProperties;
+    NSDictionary *gifProperties = frameProperties[(NSString *)kCGImagePropertyGIFDictionary];
+    
+    // 从字典中获取这一帧持续的时间
+    NSNumber *delayTimeUnclampedProp = gifProperties[(NSString *)kCGImagePropertyGIFUnclampedDelayTime];
+    if (delayTimeUnclampedProp) {
+        frameDuration = [delayTimeUnclampedProp floatValue];
+    }
+    else {
+        
+        NSNumber *delayTimeProp = gifProperties[(NSString *)kCGImagePropertyGIFDelayTime];
+        if (delayTimeProp) {
+            frameDuration = [delayTimeProp floatValue];
+        }
+    }
+    
+    // Many annoying ads specify a 0 duration to make an image flash as quickly as possible.
+    // We follow Firefox's behavior and use a duration of 100 ms for any frames that specify
+    // a duration of <= 10 ms. See <rdar://problem/7689300> and <http://webkit.org/b/36082>
+    // for more information.
+    
+    if (frameDuration < 0.011f) {
+        frameDuration = 0.100f;
+    }
+    
+    CFRelease(cfFrameProperties);
+    return frameDuration;
+}
+
++ (UIImage *)xy_getVideoThumbnail:(NSString *)filePath
+{
+    NSURL *sourceURL = [NSURL fileURLWithPath:filePath];
+    AVAsset *asset = [AVAsset assetWithURL:sourceURL];
+    AVAssetImageGenerator *imageGenerator = [[AVAssetImageGenerator alloc]initWithAsset:asset];
+    imageGenerator.appliesPreferredTrackTransform = YES;
+    CMTime time = CMTimeMake(0, 1);
+    NSError *error;
+    CGImageRef imageRef = [imageGenerator copyCGImageAtTime:time actualTime:NULL error:&error];
+    UIImage *thumbnail = [UIImage imageWithCGImage:imageRef];
+    CGImageRelease(imageRef);  // CGImageRef won't be released by ARC
+    return thumbnail;
+}
+@end