根据此处的文档:https://www.parse.com/docs/ios_guide#files-progress/iOS
这是使用完成块和progressBlock处理文件保存的建议语法。
let str = "Working at Parse is great!"
let data = str.dataUsingEncoding(NSUTF8StringEncoding)
let file = PFFile(name:"resume.txt", data:data)
file.saveInBackgroundWithBlock {
(succeeded: Bool!, error: NSError!) -> Void in
// Handle success or failure here ...
}, progressBlock: {
(percentDone: Int) -> Void in
// Update your progress spinner here. percentDone will be between 0 and 100.
}
但是,XCode 6.2会抛出此错误: 一行上的连续陈述必须用';'
分隔在这一行:
}, progressBlock: {
在这种情况下,任何人都知道如何正确使用progressBlock吗?
编辑1: 这是Obj C中的样本:
NSData *data = [@"Working at Parse is great!" dataUsingEncoding:NSUTF8StringEncoding];
PFFile *file = [PFFile fileWithName:@"resume.txt" data:data];
[file saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
// Handle success or failure here ...
} progressBlock:^(int percentDone) {
// Update your progress spinner here. percentDone will be between 0 and 100.
}];
编辑2:
另一次尝试,不同的错误:
编辑3: 原始代码,但根据评论建议使用CInt
答案 0 :(得分:1)
我使用方法签名在Objective C中定义了一个类:
- (void)saveInBackgroundWithBlock:(void(^)(BOOL succeeded, NSError *error))block progressBlock:(void(^)(int percentDone))progressBlock;
我可以从Swift那样称呼它:
let file = Test()
file.saveInBackgroundWithBlock({(success: Bool, error: NSError!) -> Void in
NSLog("1")
}, progressBlock: { (percentage: CInt) -> Void in
NSLog("2")
})
答案 1 :(得分:1)
你在方法参数周围缺少()。应该是:
file.saveInBackgroundWithBlock({ (succeeded: Bool!, error: NSError!) -> Void in
// Handle success or failure here ...
}, progressBlock: {
(percentDone: Int) -> Void in
// Update your progress spinner here. percentDone will be between 0 and 100.
})
(注意:当从Swift代码调用Objective-C时,Xcode将(在代码完成中)int
转换为CInt
,将NSInteger
转换为Int
)。