APP_STATUSBAR_HEIGHT=[UIApplication sharedApplication].statusBarFrame.size.height匹涮，包含熱點(diǎn)欄（如有）高度繁堡，標(biāo)準(zhǔn)高度為20pt舀寓，當(dāng)有個(gè)人熱點(diǎn)連接時(shí)时呀，高度為40pt。
判斷 [UIApplication sharedApplication].statusBarFrame.size.height? 是否等于40
([UIApplication sharedApplication].statusBarFrame.size.height==40?[UIScreen mainScreen].bounds.size.height-20:[UIScreen mainScreen].bounds.size.height)
