iOS 从iCloud中获取文件

• iCloud

使用UIDocumentPickerViewController

- (void)presentDocumentPicker {
    NSArray *documentTypes = @[@"public.content", @"public.text", @"public.source-code ", @"public.image", @"public.audiovisual-content", @"com.adobe.pdf", @"com.apple.keynote.key", @"com.microsoft.word.doc", @"com.microsoft.excel.xls", @"com.microsoft.powerpoint.ppt"];
    
    UIDocumentPickerViewController *documentPickerViewController = [[UIDocumentPickerViewController alloc] initWithDocumentTypes:documentTypes
                                                                                                                          inMode:UIDocumentPickerModeOpen];
    documentPickerViewController.delegate = self;
    [self presentViewController:documentPickerViewController animated:YES completion:nil];
}

在UIDocumentPickerDelegate依次执行，获取文件名，文件数据，写入沙盒Documents

#pragma mark - UIDocumentPickerDelegate

- (void)documentPicker:(UIDocumentPickerViewController *)controller didPickDocumentAtURL:(NSURL *)url {
    
    NSArray *array = [[url absoluteString] componentsSeparatedByString:@"/"];
    NSString *fileName = [array lastObject];
    fileName = [fileName stringByRemovingPercentEncoding];
    
    if ([iCloudManager iCloudEnable]) {
        [iCloudManager downloadWithDocumentURL:url callBack:^(id obj) {
            NSData *data = obj;
            
            //写入沙盒Documents
             NSString *path = [NSHomeDirectory() stringByAppendingString:[NSString stringWithFormat:@"/Documents/%@",fileName]];
            [data writeToFile:path atomically:YES];
        }];
    }
}

iCloudManager

#import <Foundation/Foundation.h>

typedef void(^downloadBlock)(id obj);

@interface iCloudManager : NSObject

+ (BOOL)iCloudEnable;

+ (void)downloadWithDocumentURL:(NSURL*)url callBack:(downloadBlock)block;

@end

判断iCloud是否可用

+ (BOOL)iCloudEnable {
    
    NSFileManager *manager = [NSFileManager defaultManager];
    
    NSURL *url = [manager URLForUbiquityContainerIdentifier:nil];

    if (url != nil) {
        return YES;
    }
    
    NSLog(@"iCloud 不可用");
    return NO;
}

通过UIDocument子类ZZDocument，传入url获取数据

+ (void)downloadWithDocumentURL:(NSURL*)url callBack:(downloadBlock)block {
    
    ZZDocument *iCloudDoc = [[ZZDocument alloc]initWithFileURL:url];
    
    [iCloudDoc openWithCompletionHandler:^(BOOL success) {
        if (success) {
            
            [iCloudDoc closeWithCompletionHandler:^(BOOL success) {
                NSLog(@"关闭成功");
            }];
            
            if (block) {
                block(iCloudDoc.data);
            }
            
        }
    }];
}

ZZDocument

#import <UIKit/UIKit.h>

@interface ZZDocument : UIDocument
@property (nonatomic, strong) NSData *data;
@end

#import "ZZDocument.h"

@implementation ZZDocument

- (BOOL)loadFromContents:(id)contents ofType:(NSString *)typeName error:(NSError * _Nullable __autoreleasing *)outError {
    self.data = contents;
    return YES;
}

@end

参考博客
http://www.cocoachina.com/ios/20160817/17382.html