Question

我需要获得扩展包的大小。为此，我有这段代码：

UIView *container = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 40)];
    UIButton *backPageButton = [UIButton buttonWithType:UIButtonTypeCustom];
    [backPageButton setFrame:CGRectMake(0, 0, 50, 30)];
    [ backPageButton setImage:[UIImage imageNamed:@"left_arrow.png"] forState:UIControlStateNormal];
    backPageButton.imageView.contentMode = UIViewContentModeScaleAspectFill;
    [backPageButton addTarget:self action:@selector(backButtonAction) forControlEvents:UIControlEventTouchUpInside];
    [backPageButton setUserInteractionEnabled:YES];
    [container addSubview:backPageButton];
    UIButton *forwardPageButton = [UIButton buttonWithType:UIButtonTypeCustom];
    [forwardPageButton setFrame:CGRectMake(30, 0, 50, 30)];
    [ forwardPageButton setImage:[UIImage imageNamed:@"right_arrow.png"] forState:UIControlStateNormal];
    [forwardPageButton addTarget:self action:@selector(forwardButtonAction) forControlEvents:UIControlEventTouchUpInside];
    forwardPageButton.imageView.contentMode = UIViewContentModeScaleAspectFill;
    [forwardPageButton setUserInteractionEnabled:YES];
    [container addSubview:forwardPageButton];

    UIBarButtonItem* item = [[UIBarButtonItem alloc] initWithCustomView:container];

// set the nav bar's right button item
self.navigationItem.rightBarButtonItem = item;

问题是它总是4096.总是。这是一个错误，还是我错过了什么？

Answer 1

您必须枚举包中的所有文件并计算尺寸，这是一个在后台/活动页面中有效的示例：

function calcPackageSize(callback) {
    var totalSize = 0;
    var queue = [], xhr = new XMLHttpRequest();
    xhr.responseType = "blob";
    xhr.onload = function() {
        totalSize += this.response.size;
        calcFile();
    };
    chrome.runtime.getPackageDirectoryEntry(function(root) {
        var rootDirNameLength = root.fullPath.length;
        calcDir(root);
        function calcDir(dir) {
            dir.createReader().readEntries(function(entries) {
                entries.forEach(function(entry) {
                    if (entry.isFile) {
                        queue.push(entry.fullPath.substr(rootDirNameLength));
                        !xhr.readyState && calcFile(); // start the request chain
                    } else {
                        calcDir(entry);
                    }
                });
            });
        }
    });
    function calcFile() {
        if (!queue.length)
            return callback && callback(totalSize);
        xhr.open("HEAD", queue.pop());
        xhr.send();
    }
}

用法：

calcPackageSize(function(size) { console.log(size) });

Chrome扩展程序包大小

1 个答案: