ALAssetPropertyDate返回“错误的”日期
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我目前正在从事一个需要读取一些（纬度，经度和日期）EXIF数据的项目。位置数据似乎正确，但是我要获取的日期似乎是“最后修改日期”。
{
CLLocation *loc = [asset valueForProperty:ALAssetPropertyLocation];
NSDate *date = [asset valueForProperty:ALAssetPropertyDate];
//Returns Last modified date(Picture was taken ... let\'s say september
//last year and it would return the date and time I \'modified\' the image).
NSString *latitude = [NSString stringWithFormat:@\"%g\",loc.coordinate.latitude];//Returns correct Latitude
NSString *longitude = [NSString stringWithFormat:@\"%g\",loc.coordinate.longitude];//Returns correct Longitude
}
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呢率篓舍烫
文档中没有任何内容表明其属性对应于图像的EXIF数据。 要访问EXIF数据，您可以使用Image I / O框架（自iOS 4.0起可用），尤其是函数。蕾跨立锌煤
到。NSDateFormatter *dateFormatter = [[NSDateFormatter new] autorelease]; dateFormatter.dateFormat = @\"y:MM:dd HH:mm:ss\"; NSDate *date = [dateFormatter dateFromString:[[[[asset defaultRepresentation] metadata] objectForKey:@\"{Exif}\"] objectForKey:@\"DateTimeOriginal\"]];NSDateFormatter *dateFormatter = [[NSDateFormatter new] autorelease]; dateFormatter.dateFormat = @\"y:MM:dd HH:mm:ss\"; for (ALAsset *asset in thousandsOfAssets) { NSAutoreleasePool *pool = [NSAutoreleasePool new]; NSDate *date = [dateFormatter dateFromString:[[[[asset defaultRepresentation] metadata] objectForKey:@\"{Exif}\"] objectForKey:@\"DateTimeOriginal\"]]; // do something [pool release]; }