問題1：loadNibNamed

static NSString *cellId = @"AboutTableViewCell";
    AboutTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellId];
    if(!cell)
    {
        cell = [[[NSBundle mainBundle]loadNibNamed:@"AboutTableViewCell" owner:self options:nil] lastObject];
    }

原因：I suspect that your leak may be coming from the outlets in the nib. Note this phrase in the docs on loadNibNamed::
To establish outlet connections, this method uses the setValue:forKey: method, which may cause the object in the outlet to be retained automatically.
In other words, loadNibNamed sometimes imposes an extra retain because of the odd way key-value-coding works.

However, that is speculation, and there's no need for it, because there's no need for you to call loadNibNamed: in the first place!

You're using a custom UITableViewCell subclass, designed in a nib? Then why not do this the normal way? Make a nib containing one top-level object: the cell. Design the cell in the nib, set its class, hook up its outlets etc. In your code, call registerNib:forCellReuseIdentifier: on the table view, to tell the table view about your nib. When you later call dequeueReusableCellWithIdentifier:, if there are no free cells in the reuse pile, the table view will load your nib and hand you cell. No muss, no fuss.

問題2：imageWithRenderingMode

tabBarItem1.selectedImage = [[UIImage imageNamed:@"img_wifi_hl"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal ];

暫時(shí)未找到解決辦法

問題3：id bridge

- (id)fetchSSIDInfo

{

    NSArray *ifs = CFBridgingRelease(CNCopySupportedInterfaces());
    id info = nil;
    for (NSString *ifnam in ifs) {
        info = CFBridgingRelease(CNCopyCurrentNetworkInfo((__bridge CFStringRef)ifnam));
        if (info && [info count]) {
            break;
        }
    }
    return info;
}

CFBridgingRelease 替換掉原來的（id bridge）