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我目前在我的应用程序中使用 MWPhotoBrowser,当我快速滚动浏览图像时,出现以下错误:

Received memory warning.
2014-02-17 16:42:35.117 App[10803:60b] *** Terminating app due to uncaught exception 'NSGenericException', reason: '*** Collection <__NSArrayM: 0x156f3160> was mutated while being enumerated.'
*** First throw call stack:
(0x2e71de83 0x38a7a6c7 0x2e71d971 0x151167 0x15139b 0x311643ff 0x3116446f 0x31164665 0x31164805 0x3111ea67 0x38f5f0af 0x38f6072f 0x38f61959 0x2e6e85b1 0x2e6e6e7d 0x2e651471 0x2e651253 0x3338b2eb 0x30f06845 0xff035 0x38f73ab7)
libc++abi.dylib: terminating with uncaught exception of type NSException

我目前正在本地加载存储在应用程序中的图像。

这是抛出异常的方法:

- (void)releaseAllUnderlyingPhotos:(BOOL)preserveCurrent {
    for (id p in _photos) {
        if (p != [NSNull null]) {
            if (preserveCurrent && p == [self photoAtIndex:self.currentIndex]) {
                continue; // skip current
            }
            [p unloadUnderlyingImage];
        }
    } // Release photos
}

任何帮助将不胜感激!

4

1 回答 1

1

我不确切知道您使用的是哪个版本的 MWPhotoBrowser,但在这里的最新版本中,该releaseAllUnderlyingPhotos:方法显示为:

- (void)releaseAllUnderlyingPhotos:(BOOL)preserveCurrent {
    // Create a copy in case this array is modified while we are looping through
    // Release photos
    NSArray *copy = [_photos copy];
    for (id p in copy) {
        if (p != [NSNull null]) {
            if (preserveCurrent && p == [self photoAtIndex:self.currentIndex]) {
                continue; // skip current
            }
            [p unloadUnderlyingImage];
        }
    }
    // Release thumbs
    copy = [_thumbPhotos copy];
    for (id p in copy) {
        if (p != [NSNull null]) {
            [p unloadUnderlyingImage];
        }
    }
}

请注意这两行:

    NSArray *copy = [_photos copy];
    for (id p in copy) {

在迭代 _photos 之前,会创建一个新数组copy以保护此迭代不_photos被其他地方修改

在您的代码中,releaseAllUnderlyingPhotos:直接从_photos数组中删除对象,但是可以在代码的其他部分修改此数组,例如,didReceiveMemoryWarning就像您的情况一样。

一旦您修改代码以迭代问题中的副本,_photosreleaseAllUnderlyingPhotos:应该消失。

于 2014-02-18T14:46:41.523 回答