IOS開發問題匯總

7.真機類比記憶體警告： [[UIApplication sharedApplication] _performMemoryWarning];

8.如果沒法串連模擬器或真機了:刪除DerivedData目錄，並且清空資源回收筒,也許還要重啟xcode4.

 

1.運行即崩潰，log下面提示：

Couldn't register com.myApp.debug with the bootstrap server. Error: unknown error code. This generally means that another instance of this process was already running or is hung in the debugger.Program received signal: “SIGABRT”.

解決辦法：重啟iphone/ipad系統

 

2.使用Three20架構，載入圖片失敗，log以下提示：

TTDASSERT failed: 0 == _queue.maxContentLength contentLength <=_queue.maxContentLength

解決辦法：在appDelegate中加入

[[TTURLRequestQueue mainQueue] setMaxContentLength:0];

 

3.一個object被dealloc之後，其指標還存在，但指向的記憶體偉空，為了防止其他地方判斷該object是否為nil的時候出現bad access問題，就應該立即寫一句object ＝ nil；

 

4.UINavigationBar的tintColor變了，backItem的顏色不變 的問題解決方案:

@interface UINavigationController (RefreshBackItem)
- (void)refreshBackItem;
@end

@implementation UINavigationController (RefreshBackItem)
- (void)refreshBackItem
{
    UINavigationBar *bar = self.navigationBar;
    UINavigationItem *backItem = bar.backItem;
    NSString *title = [backItem title];
    backItem.title = @"";
    backItem.title = title;
}
@end

5 清除通知中樞的本程式訊息：
[application cancelAllLocalNotifications];
[application setApplicationIconBadgeNumber:0];

6.- (BOOL) isiPad 

{
    return [[self model] isEqualToString:@"iPad Simulator"] || [[self platform] rangeOfString:@"iPad"].location == 0;
}

- (BOOL) isRetinaDisplay
{        
    return  ([[UIScreen mainScreen] respondsToSelector:@selector(scale)] == YES && [[UIScreen mainScreen] scale] == 2.00);
}

-(BOOL)isNewiPad 
{
        return ([self isiPad] && [self isRetinaDisplay]);
}