1、UIImageview设边框、圆角
需要引QuartzCore/QuartzCore.h>
//设UIImageView边框
CALayer *layer = [m_imgView layer];
[layer setMasksToBounds:YES];
layer.cornerRadius = 10.0;//设圆角
[layer setBorderWidth:1];
[layer setBorderColor:[[UIColor blackColor] CGColor]];
2、bounds属性和frame属性区别
frame指的是：该view在父view坐标系统中的位置和大小.
bounds指的是：该view在本身坐标系统中的位置和大小.
3、导航navigationController设置按钮背景图片
UIImage *backImage = [UIImage imageNamed:@"ip_bt-back.png"];
UIButton *backBtn = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, backImage.size.width, backImage.size.height)];
[backBtn addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];
[backBtn setBackgroundImage:backImage forState:UIControlStateNormal];
UIBarButtonItem *leftBtn = [[UIBarButtonItem alloc] initWithCustomView:backBtn];
self.navigationItem.leftBarButtonItem = leftBtn;
4、ios5加载自定义单元格
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"priceRecordCell";
//加载nib
static BOOL nibsRegistered = NO;
if (!nibsRegistered) {
UINib *nib = [UINib nibWithNibName:@"PriceRecordCell" bundle:nil];
[tableView registerNib:nib forCellReuseIdentifier:CellIdentifier];
nibsRegistered = YES;
}
PriceRecordCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[PriceRecordCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
// Configure the cell...
cell.nickName.text = @"爱我中华";
cell.priceLab.text = @"价格 ￥100.00";
cell.lastTimeLab.text = @"2012-10-15 18:00:08";
return cell;
}
5、tableview单元格分割线设置
//不需要分割线
self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
6、ios4工程在ios5上运行会出现ARC问题，在Compile Sources 下的Compiler Flags属性中添加-fno-objc-arc，可解决该问题 。
7、UIImageView 上添加点击事件
UIImageView *imageView =[[UIImageView alloc ]initWithFrame :CGRectMake (100 , 100 , 200 , 200 )];
imageView. image =[ UIImage imageNamed : @"test.png"];
//事件可用设置
imageView. userInteractionEnabled = YES ;
UITapGestureRecognizer *tap = [[ UITapGestureRecognizer alloc ] initWithTarget : self action : @selector (clickImage)];
[imageView addGestureRecognizer :tap];
8、ios5 UIView 设圆角
需添加#import <QuartzCore/QuartzCore.h>
centerView.layer.cornerRadius = 6.0f;
9、获取文件路径
//获取沙盒路径
NSString *sandboxPath = NSHomeDirectory();
NSLog(@"sandboxPath :%@",sandboxPath);
NSString *documentPath = [sandboxPath stringByAppendingPathComponent:@"Documents"];
NSLog(@"documentPath : %@",documentPath);
//获取沙盒中的文件目录
NSArray *documentDirectories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
//遍历得到的路径
for (int i=0; i<[documentDirectories count]; i++) {
NSLog(@"%@",[documentDirectories objectAtIndex:i]);
}
10、自定义单元格中，如果自定义单元格中有按钮点击事件，不可设置以下属性，会阻塞按钮事件解发。 (2012-10-16)
cell_1.userInteractionEnabled = NO；//单元格不可点击
11、内存过低警告，清除内存
通过消息通知方式提示并清除
- (id)init{
//当内存过低时，清空内存
NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
[nc addObserver:self selector:@selector(clearCache) name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
}
12、NSBundle可以获取当前程序的资源，得到它，可以获取当前资源中的相关文件，并进行操作。
//NSBundle获取当前应用资源
NSBundle *appBundle = [NSBundle mainBundle];
//bundle得到文件
NSString *path = [appBundle pathForResource:@"first" ofType:@"png"];
if (path != nil) {
NSLog(@"path : %@",path);
}
//bundle得到类
Class class = [appBundle classNamed:@"Test"];
Test *tinstance = [[class alloc] init];
[tinstance test];
//bundle加载xib
[appBundle loadNibNamed:@"ThirdViewController" owner:self options:nil];
//bundle中还有很多其它方法，可查api
13、应用状态、状态切换，通过它可了解应用在运行时的各个状态。
常见应用中多种状态：末运行--**--末**--后台运行--暂停--**
//启动应用时调用
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
//...... NSLog(@"====didFinishLaunchingWithOptions.........%@",NSStringFromSelector(_cmd));
return YES;
}
//按下主窗口按钮时调用(末**)
- (void)applicationWillResignActive:(UIApplication *)application
{
NSLog(@"====applicationWillResignActive");
}
//按下主窗口按钮时调用(后台运行，末**，5秒后进入暂停)
- (void)applicationDidEnterBackground:(UIApplication *)application
{
//进行入后运行时，该方法是保存数据的最佳方法
//[object saveChanges];
NSLog(@"====applicationDidEnterBackground");
}
//按主窗口按钮退出后，再按下应用图标时调用(**)
- (void)applicationWillEnterForeground:(UIApplication *)application
{
NSLog(@"====applicationWillEnterForeground");
}
//按主窗口按钮退出后，再按下应用图标时调用(**)
- (void)applicationDidBecomeActive:(UIApplication *)application
{
NSLog(@"====applicationDidBecomeActive");
}
//ios4之前实现该方法，在该方法保存数据最佳
- (void)applicationWillTerminate:(UIApplication *)application
{
NSLog(@"====applicationWillTerminate");
}
14、沙盒理解
每个ios应用都有自己的应用沙盒(application sandbox)，应用沙盒就是文件系统目录，但与文件系统其他部分隔离。应用必须待在自己的沙盒里，其他应用不能访问该沙盒。
15、navigation导航
//设置Navigation Bar背景
UIImage *title_bg = [UIImage imageNamed:@"ip_titelbar.png"];
[self.navigationController.navigationBar setBackgroundImage:title_bg forBarMetrics:UIBarMetricsDefault];
UIView *_view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 360, 40)];
UILabel *titleLab = [[UILabel alloc] initWithFrame:CGRectMake(120, 0, 100, 20)];
titleLab.text = @"快速竞拍";
titleLab.textColor = [UIColor redColor];
titleLab.font = [UIFont fontWithName:@"Arial" size:18];
titleLab.backgroundColor = [UIColor clearColor];
[_view addSubview:titleLab];
resultLab = [[UILabel alloc] initWithFrame:CGRectMake(122, 20, 100, 20)];
resultLab.backgroundColor = [UIColor clearColor];
resultLab.font = [UIFont fontWithName:@"Arial" size:14];
[_view addSubview:resultLab];
//刷新按钮
UIButton *refreshBtn = [[UIButton alloc] initWithFrame:CGRectMake(255, 8, 50, 30)];
[refreshBtn setBackgroundImage:[UIImage imageNamed:@"ip_bt_shuaxin.png"] forState:UIControlStateNormal];
[refreshBtn addTarget:self action:@selector(refurbish) forControlEvents:UIControlEventTouchUpInside];
[_view addSubview:refreshBtn];
self.navigationItem.titleView = _view;
//显示导航
// self.navigationController.navigationBarHidden = NO;
16、ipad中UITabBarController添加ViewController。
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
MasterViewController *masterViewController = [[MasterViewController alloc] initWithNibName:@"MasterViewController" bundle:nil];
UINavigationController *masterNavigationController = [[UINavigationController alloc] initWithRootViewController:masterViewController];
DetailViewController *detailViewController = [[DetailViewController alloc] initWithNibName:@"DetailViewController" bundle:nil];
UINavigationController *detailNavigationController = [[UINavigationController alloc] initWithRootViewController:detailViewController];
masterViewController.detailViewController = detailViewController;
self.splitViewController = [[UISplitViewController alloc] init];
self.splitViewController.delegate = detailViewController;
self.splitViewController.viewControllers = [NSArray arrayWithObjects:masterNavigationController, detailNavigationController, nil];
//首页barTab
UITabBarController *tabBarController = [[UITabBarController alloc] init];
self.splitViewController.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"首页" image:[UIImage imageNamed:@"f.jpg"] tag:0];
//购物车barTab
CartViewController *cartVC = [[CartViewController alloc] initWithNibName:@"CartViewController" bundle:nil];
cartVC.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"购物车" image:[UIImage imageNamed:@"f.jpg"] tag:0];
//条码购barTab
BarCodeViewController *barcodeVC = [[BarCodeViewController alloc] initWithNibName:@"BarCodeViewController" bundle:nil];
barcodeVC.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"条码购" image:[UIImage imageNamed:@"f.jpg"] tag:0];
//更多barTab
MoreViewController *moreVC = [[MoreViewController alloc] initWithNibName:@"MoreViewController" bundle:nil];
moreVC.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"更多" image:[UIImage imageNamed:@"f.jpg"] tag:0];
//controller数组
NSArray *controllers = [NSArray arrayWithObjects:self.splitViewController,cartVC,barcodeVC,moreVC, nil];
tabBarController.viewControllers = controllers;
self.window.rootViewController = tabBarController;
// self.window.rootViewController = self.splitViewController;
[self.window makeKeyAndVisible];
return YES;
}
17、如何获取应用存放文件根路径：
//根路径
NSString *homePath = [[NSBundle mainBundle] executablePath];
NSArray *strings = [homePath componentsSeparatedByString: @"/"];
NSString *executableName = [strings objectAtIndex:[strings count]-1];
NSString *baseDirectory = [homePath substringToIndex:
[homePath length]-[executableName length]-1];
NSString *fileName = [NSString stringWithFormat:@"%@/test.txt",baseDirectory];
NSLog(@"filePath: %@",fileName);
18、block类似匿名函数
以为例子：
static int outA = 8;
static NSString *[email protected]"";
int(^myPtr)(int,NSString *)=^(int a,NSString *b){
c=b;
return outA+a;
};
outA = 5;//改变outA
int result = myPtr(2,@"test");//结果为10，outA是复制的，后面改变outA无效
NSLog(@"result : %i",result);
19、performSelector的应用，它可直接调用实例的方法，能延迟执行方法时间。
- (void) test:(NSString *) str;
- (void) test:(NSString *) str{
NSLog(@"you input is : %@",str);
}
//调用方法
[self performSelector:@selector(test:) withObject:@"dwen"];
[self performSelector:@selector(test:) withObject:@"wen" afterDelay:2.0f];//两秒后执行
20、UIButton中addTarget中传参问题，该事件可以通过setTag方法进行传整数。
UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, width, height)];
//action参数中写入事件执行方法
[button addTarget:self action:@selector(action:) forControlEvents:UIControlEventTouchUpInside];
//在button的tag中添加你需要传递的参数
[button setTag:100];
//action方法
-(void)action:(id)sender{
int i = [sender tag];
}
21、沙盒中包含三个文件夹，Documents 、Library和tmp
//获取Documents目录
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES);
NSString *documentDirectory = [paths objectAtIndex:0];
NSLog(@"%@",documentDirectory);
//获取当前应用中文件路径
NSString *filename = [documentDirectory stringByAppendingPathComponent:@"w12122.jpg"];
NSLog(@"%@",filename);
//获取tmp目录
NSString *tempPath = NSTemporaryDirectory();
NSString *tempFile = [tempPath stringByAppendingPathComponent:@"w12122.jpg"];
NSLog(@"tempFile :%@",tempFile);
22、NSString截取字符串
NSString *str = @"B12121.jpg";
NSRange range = [str rangeOfString:@"."];
NSLog(@"%i",range.location);
NSLog(@"%@",[str substringToIndex:range.location]);
23、UINavigationBar
//创建导航栏集合
UINavigationItem *navigationItem = [[UINavigationItem alloc] initWithTitle:nil];
//创建一个左边按钮
UIBarButtonItem *leftButton = [[UIBarButtonItem alloc] initWithTitle:@"返回"
style:UIBarButtonItemStyleBordered
target:self
action:@selector(back)];
//设置导航栏内容
[navigationItem setTitle:@"拍品列表"];
//把导航栏集合添加入导航栏中，设置动画关闭
[navigationBar pushNavigationItem:navigationItem animated:NO];
//把左右两个按钮添加入导航栏集合中
[navigationItem setLeftBarButtonItem:leftButton];
24、在navigationController中添加右边多个按钮。效果图：
代码如下：
//添加导航右边按钮
UIToolbar *tools = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 150, 44)];
[tools setTintColor:[self.navigationController.navigationBar tintColor]];
[tools setAlpha:[self.navigationController.navigationBar alpha]];
NSMutableArray *buttons = [[NSMutableArray alloc] initWithCapacity:1];
UIBarButtonItem *firstBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action:@selector(showSpecial)];
[buttons addObject:firstBtn];
[tools setItems:buttons animated:NO];
UIBarButtonItem *myBtn = [[UIBarButtonItem alloc] initWithCustomView:tools];
self.navigationItem.rightBarButtonItem = myBtn;
25、循环删除uiview
for (UIView *subview in scrollView.subviews) {
if ([subview isKindOfClass:[CatalogView class]]) {
[subview removeFromSuperview];
}
}
26、ios4以前内存管理
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