程序中會(huì)使用到發(fā)短信功能，由于iOS的限制炭臭，導(dǎo)致只能調(diào)用系統(tǒng)短信發(fā)送袍辞，常用的方法是采用Apple提供的MFMessageComposeViewController來(lái)訪問(wèn)系統(tǒng)發(fā)短信界面，但是由于MFMessageComposeViewController會(huì)受到app內(nèi)部navigationBar的干擾導(dǎo)致navigationBar也會(huì)跟著變色凿试，但是因?yàn)橛疑辖欠祷劓I初始顏色為藍(lán)色那婉，如果navigationBar顏色較深的話會(huì)導(dǎo)致看不見(jiàn)返回鍵党瓮，下面提供一種更改返回鍵顏色的方法：
MFMessageComposeViewController *picker = [[MFMessageComposeViewController alloc] init];
picker.messageComposeDelegate = self;
picker.navigationBar.tintColor = [UIColor blackColor];
if (numberString != nil) {
picker.recipients = [NSArray arrayWithObject:numberString];
}
picker.body = contentString;
[self presentModalViewController:picker animated:YES];
[[[[picker viewControllers] lastObject] navigationItem] setTitle:NSLocalizedString(@"MEETME_SETTING_INVITED_STRING", nil)];
