我正在尝试拉出 UIActionSheet 以显示当前登录到 Twitter 设置的所有帐户。我获取所有匹配 Twitter 类型的帐户的 NSArray,然后运行以下代码:
UIActionSheet *chooseaccount = [[UIActionSheet alloc]initWithTitle:@"Choose Account" delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles: nil];
for (int i = 0; i < [arrayOfAccounts count]--; i++) {
[chooseaccount addButtonWithTitle:[arrayOfAccounts objectAtIndex:i]];
}
[chooseaccount addButtonWithTitle:@"Cancel"];
chooseaccount.cancelButtonIndex = arrayOfAccounts.count;
chooseaccount showInView:self.tabBarController.view];
但是,我收到错误“不允许分配给 Objective-C 消息的‘只读’返回结果”
对于让 UIActionSheet 显示 Twitter 帐户的所有用户名有什么建议吗?
更新:
经过多次建议后,我将代码更改为:
-(void)twitteraccess {
ACAccountStore *account = [[ACAccountStore alloc] init];
ACAccountType *accountType = [account accountTypeWithAccountTypeIdentifier:
ACAccountTypeIdentifierTwitter];
[account requestAccessToAccountsWithType:accountType options:nil
completion:^(BOOL granted, NSError *error)
{
if (granted == YES)
{
NSLog(@"Granted");
NSArray *arrayOfAccounts = [account
accountsWithAccountType:accountType];
if ([arrayOfAccounts count] > 0)
{
NSLog(@"%i", [arrayOfAccounts count]);
if ([arrayOfAccounts count] > 1) {
NSLog(@"Greaterthan1");
UIActionSheet *chooseaccount = [[UIActionSheet alloc]initWithTitle:@"Choose Account" delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles: nil];
for (int i = 0; i < [arrayOfAccounts count]; i++) {
ACAccount * account = [arrayOfAccounts objectAtIndex:i];
[chooseaccount addButtonWithTitle:account.username];
NSLog(@"%@", account.username);
}
[chooseaccount addButtonWithTitle:@"Cancel"];
chooseaccount.cancelButtonIndex = arrayOfAccounts.count;
[chooseaccount showInView:self.tabBarController.view];
}
else {
}
}
}
else {
if(error.code == 6){
[self performSelectorOnMainThread:@selector(alertmessagetwitter)
withObject:nil
waitUntilDone:YES]; }
}
}];
}
操作表确实出现,但大约需要 25 秒才能显示。
最佳答案
您不能编写[arrayOfAccounts count]--
,这本质上会扩展为:
[arrayOfAccounts count] = [arrayOfAccounts count] - 1; // assigning to readonly
相反,只需使用[arrayOfAccounts count] - 1
(或快速枚举)。
for (int i = 0; i < [arrayOfAccounts count]-1; i++) { //...
编辑有关 InvalidArgumentException
:
假设arrayOfAccounts
包含ACAccount
对象而不是NSString
:
for (int i = 0; i < [arrayOfAccounts count]-1; i++) { //...
ACAccount * account = [arrayOfAccounts objectAtIndex:i];
[chooseaccount addButtonWithTitle:[account userName]];
}
关于iphone - 使用 NSArray 填充 UIActionSheet 按钮,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/14284368/