iOS开发-缓存图片到沙盒--思路

1.图片存储到沙盒中

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NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);

        NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:[NSString stringWithFormat:@"pic_%d.png", myI]];   // 保存文件的名称

        [UIImagePNGRepresentation(myImage)writeToFile: filePath    atomically:YES];

2.在plist中保存路径

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NSMutableDictionary *info = [[NSMutableDictionary alloc]init];

 

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);

 

NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:[NSString stringWithFormat:@"pic_%d.png", conut_]];   // 保存文件的名称

 

[info setObject:filePath forKey:@"img"];

[specialArr addObject:info];

3.使用图片

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NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);

NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:[NSString stringWithFormat:@"pic_%d.png", (int)current]];  // 保存文件的名称

UIImage *img = [UIImage imageWithContentsOfFile:filePath];

以上是OC语言，如果可以改成swift3.0语言更佳，以后有时间来更新一下。