iphone - 在 plist 中存储图像

Question

我们如何将图像存储在 plist 文件中。这个 plist 文件存储在哪里？谁能给我举个例子吗？将不胜感激!

Answer 1

UIImage 没有直接实现存储在 plist 中所必需的 NSCoder 协议(protocol)。

但是，像下面这样添加是相当容易的。

UIImage+NSCoder.h

#import <Foundation/Foundation.h>

@interface UIImage (MyExtensions)
- (void)encodeWithCoder:(NSCoder *)encoder;
- (id)initWithCoder:(NSCoder *)decoder;
@end

UIImage+NSCoder.m

#import "UIImage+NSCoder.h"

@implementation UIImage (MyExtensions)

- (void)encodeWithCoder:(NSCoder *)encoder
{
  [encoder encodeDataObject:UIImagePNGRepresentation(self)];
}

- (id)initWithCoder:(NSCoder *)decoder
{
  return [self initWithData:[decoder decodeDataObject]];
}

@end

添加后，您将能够使用 ie 将 UIImages 存储在 plist 中

// Get a full path to a plist within the Documents folder for the app
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
                                                     NSUserDomainMask,
                                                     YES);
NSString *path = [NSString stringWithFormat:@"%@/my.plist",
                                              [paths objectAtIndex:0]];

// Place an image in a dictionary that will be stored as a plist
[dictionary setObject:image forKey:@"image"];

// Write the dictionary to the filesystem as a plist
[NSKeyedArchiver archiveRootObject:dictionary toFile:path];

注意:我不建议这样做，除非您真的想要，即对于非常小的图像。