SimpleCode

在键盘上添加按钮

Snip20170919_1.png

    //直接将按钮添加到虚拟键盘上面
    
    //通常会使用UIToolBar类型的视图
    UIToolbar *bar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 375, 40)];
    bar.barStyle = UIBarStyleBlack;
    //添加按钮
    //空白
    UIBarButtonItem *spaceItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
    //按钮
    UIBarButtonItem *doneItem1 = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(doneAction:)];
    UIBarButtonItem *midItem = [[UIBarButtonItem alloc] initWithTitle:@"Mid" style:UIBarButtonItemStylePlain target:self action:@selector(doneAction:)];
    UIBarButtonItem *doneItem2 = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(doneAction:)];
    
    bar.items = @[doneItem2,spaceItem,midItem,spaceItem, doneItem1];
    //在虚拟键盘上面添加视图
    textView.inputAccessoryView = bar;
    
    self.view.backgroundColor = [UIColor whiteColor];

导航栏按钮

self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"submitFriendCycle.png"] style:UIBarButtonItemStylePlain target:self action:@selector(submitBtnClick)];


UIBarButtonItem *negativeSeperator = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
negativeSeperator.width = -12;//此处修改到边界的距离，请自行测试

沙盒目录

[NSBundle mainBundle] pathForResource:@"submitFriendCycle@2x" ofType:@"png"]

从xib加载

SubmitController * ctrl = [[SubmitController alloc]initWithNibName:@"SubmitController" bundle:nil]

异步请求数据 主线程刷新UI

dispatch_async(dispatch_get_global_queue(0, 0), ^{

        //下载数据（这里写的是使用AFNetWorking请求的数据）

       dispatch_async(dispatch_get_main_queue(), ^{

        //更新视图（这里写的是，要把数据显示出来）

       });

    });

AFNetWorking GET

AFHTTPSessionManager *session = [AFHTTPSessionManager manager];
[session GET:@"需要请求的url" parameters:nil success:^(NSURLSessionDataTask *task, id responseObject) {
        NSLog(@"请求成功");
} failure:^(NSURLSessionDataTask *task, NSError *error) {
        NSLog(@"请求失败");        
}];

图片的平铺拉伸

    UIImage *image = [UIImage imageNamed:@""];
    image = [image stretchableImageWithLeftCapWidth:image.size.width/2 topCapHeight:image.size.height/2];

UITextfiled输入文字属性

NSDictionary *attrsDictionary =@{
                    NSFontAttributeName: self.textField.font,
                    NSKernAttributeName:[NSNumber numberWithFloat:10.0f]//这里修改字符间距
                    };
self.textField.attributedText=[[NSAttributedString alloc]initWithString:text attributes:attrsDictionary];

动态计算Label高度

单行文本：
NSString *content = @"欢迎来到北京";
CGSize size =[content sizeWithAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:14]}];

多行文本：
UILabel *label = [UILabel new]; 
label.numberOfLines = 0;//多行显示，计算高度
label.font = [UIFont systemFontOfSize:14];
CGSize titleSize = [label.text boundingRectWithSize:CGSizeMake(kScreen_Width, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:14]} context:nil].size;

iOS UITabBarController切换选项卡，关闭模态视图回到主视图

从任意页面，切换选项卡
关闭模态视图回到主视图

//跳转并切换选项卡
dispatch_async(dispatch_get_main_queue(), ^{
    [self.navigationController popToRootViewControllerAnimated:NO];
    SLTabBarController *tabC = (SLTabBarController *)[UIApplication sharedApplication].keyWindow.rootViewController;
    tabC.selectedIndex= 1;
});

让timer不因scrollView的滚动而停止

[[NSRunLoop currentRunLoop] addTimer:self.timer forMode:NSRunLoopCommonModes];

imageWithContentsOfFile方法不能加载Assets.xcassets里的图片