小知识点

ios修改textField的placeholder的字体颜色、大小

textField.placeholder = @"username is in here!";  
[textField setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"];  
[textField setValue:[UIFont boldSystemFontOfSize:16] forKeyPath:@"_placeholderLabel.font"]; 

导航栏隐藏但是上面有按钮

[self.navigationController.navigationBar setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault];
[self.navigationController.navigationBar setShadowImage:[[UIImage alloc] init]];

AFNetworking

默认接收 json 格式的响应（因为这是在 iOS 平台上的框架，一般不需要 text/html），如果想要返回 html，需要设置 acceptableContentTypes

http://www.tuicool.com/articles/rmURJbB

设置AFNetworking的请求头:

AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    manager.requestSerializer = [AFHTTPRequestSerializer serializer];
    [manager.requestSerializer setValue:@"Dalvik/1.6.0 (Linux; U; Android 4.3; R6007 Build/JLS36C) Paros/3.2.13" forHTTPHeaderField:@"User-Agent"];
    [manager.requestSerializer setValue:@"api.miaotu.net" forHTTPHeaderField:@"Host"];
    [manager.requestSerializer setValue:@"Keep-Alive" forHTTPHeaderField:@"Connection"];

富文本

NSMuttableAttstring
http://blog.csdn.net/reylen/article/details/41208747

Masonry自动布局详解七：ScrollView循环布局

http://blog.csdn.net/woaifen3344/article/details/50114595

确定tableviewcell中的button在tableview的第几行

//在设置的Button的selector的方法中如下设置：
- (void)pressed:(id)sender {
    UITableViewCell * cell = (UITableViewCell *)[[sender superview] superview];
    NSIndexPath * path = [self.tableView indexPathForCell:cell];
    NSLog(@"index row%d", [path row]);
    //NSLog(@"view:%@", [[[sender superview] superview] description]);
}
- (void)pressed:(id)sender; //方法是我设置的button的selector

UITextView的placeholder

http://www.cnblogs.com/easonoutlook/archive/2012/12/28/2837665.html