7.真机模拟内存警告： [[UIApplication sharedApplication] _performMemoryWarning];
8.如果没法连接模拟器或真机了:删除DerivedData目录，并且清空回收站,也许还要重启xcode4.
1.运行即崩溃，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”.
解决办法：重启iphone/ipad系统
2.使用Three20框架，加载图片失败，log以下提示：
TTDASSERT failed: 0 == _queue.maxContentLength contentLength <=_queue.maxContentLength
解决办法：在appDelegate中加入
[[TTURLRequestQueue mainQueue] setMaxContentLength:0];
3.一个object被dealloc之后，其指针还存在，但指向的内存伟空，为了防止其他地方判断该object是否为nil的时候出现bad access问题，就应该立即写一句object ＝ nil；
4.UINavigationBar的tintColor变了，backItem的颜色不变 的问题解决方案:
@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;}@end5 清除通知中心的本程序消息：[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]);}
转载于:https://www.cnblogs.com/xiaouisme/archive/2012/04/11/2442995.html
