个人iOS学习笔记~
1.检测网络状态
//监测网络状态
[manager.reachabilityManager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
//status即为判断的状态
if (status == AFNetworkReachabilityStatusReachableViaWiFi) {
NSLog(@"Wifi");
}else if (status == AFNetworkReachabilityStatusReachableViaWWAN){
NSLog(@"GPRS/3G");
}else if (status == AFNetworkReachabilityStatusNotReachable){
NSLog(@"网络未连接");
}else if (status == AFNetworkReachabilityStatusUnknown){
NSLog(@"不能识别");
}
}];
//启动网络检测 Monitoring监测
[manager.reachabilityManager startMonitoring];
//原理即为调用Block2.文件下载（系统原生）
- (void)downloadFile{
// NSString * url = @"http://10.10.158.179/1530/lalala.mp3";
NSString * url = @"http://image2.90e.com/image/1600x900/1497.jpg";
//创建下载器
AFURLSessionManager * manager = [[AFURLSessionManager alloc]initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
//进行擦除中文 转码操作
url = [url stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
// NSLog(@"%@",url);
NSURLRequest * request = [NSURLRequest requestWithURL:[NSURL URLWithString:url]];
//下载任务
/*
1、请求对象
2、进度
*/
//进度
__autoreleasing NSProgress * progress = nil;
//当调用下方block时候会自动创建preogress对象，更改其值
NSURLSessionDownloadTask * task = [manager downloadTaskWithRequest:request progress:&progress destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {
//告诉下载器 将文件下载到哪个路径
//找到程序的文件夹 沙盒路径
NSString * path = [NSHomeDirectory() stringByAppendingPathComponent:@"3.jpg"];
return [NSURL fileURLWithPath:path];
} completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) {
//下载完成的回调
if (error) {
NSLog(@"%@",error);
}else{
NSLog(@"下载完成");
}
}];
//启动下载
[task resume];
NSLog(@"%@",NSHomeDirectory());
_progress = progress;
[_progress addObserver:self forKeyPath:@"fractionCompleted" options:NSKeyValueObservingOptionNew context:NULL];
}
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context{
if (object == _progress && [keyPath isEqualToString:@"fractionCompleted"]) {
//监测进度
NSLog(@"%.2f",_progress.fractionCompleted);
}
}3.Post请求
数据请求方式
1、Get 通常用于下载数据 网址以明文的形式进行显示
特点:主网址后需添加?，?后面进行拼接参数，多个参数之间以&进行拼接
2、Post 通常用于上传数据 网址以密文的形式进行显示 不会使网址的参数外漏 多用于登录或注册账号
特点:主网址后无需添加?，所需参数需添加到网址的附加信息中(以字典的形式进行存储) 保密程度高
*/
- (void)postRequest{
NSString * url = @"http://10.0.8.8/sns/my/login.php";
AFHTTPRequestOperationManager * manager = [AFHTTPRequestOperationManager manager];
manager.responseSerializer = [AFHTTPResponseSerializer serializer];
//POST的附加信息 parameters后即为所需传的参数
NSDictionary * dict = @{@"username":@"sure0705",@"password":@"zq851099"};
[manager POST:url parameters:dict success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSDictionary * dict = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingMutableContainers error:nil];
NSLog(@"%@",dict[@"message"]);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"请求失败");
}];
}4.重写KVC防止报错
//重写方法 以防报错
- (void)setValue:(id)value forUndefinedKey:(NSString *)key{
NSLog(@"没有找到Key:%@",key);
}5.// button字体竖向显示
[button.titleLabel setLineBreakMode:NSLineBreakByWordWrapping];6.指定四个角为圆角
UIView *view2 = [[UIView alloc] initWithFrame:CGRectMake(120, 10, 80, 80)];
view2.backgroundColor = [UIColor redColor];
[self.view addSubview:view2];
UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:view2.bounds byRoundingCorners:UIRectCornerTopLeft | UIRectCornerTopRight cornerRadii:CGSizeMake(10, 10)];
CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
maskLayer.frame = view2.bounds;
maskLayer.path = maskPath.CGPath;
view2.layer.mask = maskLayer;
只需修改
* UIRectCornerTopLeft
* UIRectCornerTopRight
* UIRectCornerBottomLeft
* UIRectCornerBottomRight
* UIRectCornerAllCorners7.断点定位程序崩溃处
add Exception Breakpoint8.去掉cell的分割线
//去掉分割线
_tableView.separatorStyle = UITableViewCellSelectionStyleNone;9.去掉cell选中效果
//去掉cell选中效果
cell.selectionStyle = UITableViewCellSelectionStyleNone;10.xcode7 http请求
1 在Info.plist中添加NSAppTransportSecurity类型Dictionary。
2 在NSAppTransportSecurity下添加NSAllowsArbitraryLoads类型Boolean,值设为YES11.时间戳
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];//设置你想要的格式,hh与HH的区别:分别表示12小时制,24小时制
NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];
[formatter setTimeZone:timeZone];
NSDate *datenow = [NSDate date];
//设置一个字符串的时间
NSMutableString *datestring = [listdic objectForKey:@"FIRSTTIME"];
// //注意 如果20141202052740必须是数字，如果是UNIX时间，不需要下面的插入字符串。
// [datestring insertString:@"-" atIndex:4];
// [datestring insertString:@"-" atIndex:7];
// [datestring insertString:@" " atIndex:10];
// [datestring insertString:@":" atIndex:13];
// [datestring insertString:@":" atIndex:16];
NSLog(@"datestring==%@",datestring);
NSDateFormatter * dm = [[NSDateFormatter alloc]init];
//指定输出的格式 这里格式必须是和上面定义字符串的格式相同，否则输出空
[dm setDateFormat:@"YYYY-MM-dd HH:mm:ss"];
NSDate * newdate = [dm dateFromString:datestring];
long dd = (long)[datenow timeIntervalSince1970] - [newdate timeIntervalSince1970];
NSString *timeString=@"";
NSString *timeString2=@"";
NSString *timeString3=@"";
NSString *timeString4=@"";
timeString = [NSString stringWithFormat:@"%ld", dd/3600];//时
timeString2 = [NSString stringWithFormat:@"%ld", (dd%3600)/60];//分
timeString3=[NSString stringWithFormat:@"%@小时%@分钟", timeString,timeString2];
timeString4 = [NSString stringWithFormat:@"%ld", dd/86400];//天
if (dd/86400>1)
{
timeString = [NSString stringWithFormat:@"%ld", (dd%86400)/3600];//时
timeString4 = [NSString stringWithFormat:@"%ld", dd/86400];//天
timeString2 = [NSString stringWithFormat:@"%ld", ((dd%86400)%3600)/60];//分
timeString3=[NSString stringWithFormat:@"%@天%@小时", timeString4,timeString];
}
if (dd/3600<1)
{
timeString = [NSString stringWithFormat:@"%ld", dd/60];
timeString3=[NSString stringWithFormat:@"%@分钟", timeString];
}
if (dd/3600>1&&dd/86400<1){
timeString3=[NSString stringWithFormat:@"%@小时%@分钟", timeString,timeString2];
}12 ios 数组最大值，最小值，平均值，和的快速算法
NSArray *testArray = [NSArray arrayWithObjects:@"2.0", @"2.3", @"3.0", @"4.0",@"10",nil];
NSNumber *sum1 = [testArray valueForKeyPath:@"@sum.floatValue"];
NSNumber *avg1 = [testArray valueForKeyPath:@"@avg.floatValue"];
NSNumber* max1=[testArray valueForKeyPath:@"@max.floatValue"];
NSNumber* min1=[testArray valueForKeyPath:@"@min.floatValue"];
NSLog(@"%@ %@ %@ %@",sum1,avg1,max1,min1);13 iOS-获取当前时间的年、月、日、时、分、秒
//获取当前时间
NSDate *now = [NSDate date];
NSLog(@"now date is: %@", now);
NSCalendar *calendar = [NSCalendar currentCalendar];
NSUInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
NSDateComponents *dateComponent = [calendar components:unitFlags fromDate:now];
int year = [dateComponent year];
int month = [dateComponent month];
int day = [dateComponent day];
int hour = [dateComponent hour];
int minute = [dateComponent minute];
int second = [dateComponent second];
NSLog(@"year is: %d", year);
NSLog(@"month is: %d", month);
NSLog(@"day is: %d", day);
NSLog(@"hour is: %d", hour);
NSLog(@"minute is: %d", minute);
NSLog(@"second is: %d", second);14.读取plist文件
NSString *plistPath = [[NSBundle mainBundle] pathForResource:@"config" ofType:@"plist"];
NSDictionary *dictionary = [[NSDictionary alloc] initWithContentsOfFile:plistPath];
NSLog(@"config dictionary = %@",dictionary);15.改变tabbar字体颜色，选中和未选中
[[UITabBarItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor whiteColor], UITextAttributeTextColor,nil] forState:UIControlStateNormal];16.怎么在其他视图控制器中切换根视图控制器
WorkOrderListViewController *homePageViewController = [[WorkOrderListViewController alloc] init];
UIApplication *app =[UIApplication sharedApplication];
AppDelegate *app2 = app.delegate;
app2.window.rootViewController = homePageViewController;17.16进制颜色
#define UIColorFromRGBValue(rgbValue) [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0]
UIColorFromRGBValue(0x7e7e7e);18.多线程

19.跳转隐藏tabbar
/1.设置self.tabBarController.tabBar.hidden=YES;
self.tabBarController.tabBar.hidden=YES;
//2.如果在push跳转时需要隐藏tabBar，设置self.hidesBottomBarWhenPushed=YES;
self.hidesBottomBarWhenPushed=YES;
NextViewController *next=[[NextViewController alloc]init];
[self.navigationController pushViewController:next animated:YES];
self.hidesBottomBarWhenPushed=NO;
//并在push后设置self.hidesBottomBarWhenPushed=NO;
//这样back回来的时候，tabBar会恢复正常显示。20.xib连线错误
报这个错，检查xib连线，是否有重复多连的
this class is not key value coding-compliant for the key XXX
21.tableview iOS 8自适应高度
这个新特性，意味着View被Autolayout调整frame后，会自动拉伸和收缩SupView。
具体到Cell,要求cell.contentView的四条边都与内部元素有约束关系。
在TableViewController里
- (void)viewDidLoad {
[super viewDidLoad];
//添加这两行代码
self.tableView.estimatedRowHeight = 44.0f;
self.tableView.rowHeight = UITableViewAutomaticDimension;
}22.cell复用
/* 类方法，返回cell /
+ (instancetype)cellWithTableView:(UITableView *)tableView {
static NSString *ReuseID = @“cell的id”;
InsurerListTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ReuseID];
if (cell == nil) {
cell = [[[NSBundle mainBundle] loadNibNamed:@“cell类名” owner:self options:nil] lastObject];
}
return cell;
}
23.block遍历
enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
}24.edgesForExtendedLayout
self.edgesForExtendedLayout = UIRectEdgeNone;
edgesForExtendedLayout
typedef NS_OPTIONS(NSUInteger, UIRectEdge) {
UIRectEdgeNone = 0,
UIRectEdgeTop = 1 << 0,
UIRectEdgeLeft = 1 << 1,
UIRectEdgeBottom = 1 << 2,
UIRectEdgeRight = 1 << 3,
UIRectEdgeAll = UIRectEdgeTop | UIRectEdgeLeft | UIRectEdgeBottom | UIRectEdgeRight
} 25 . 当前屏幕方向interfaceOrientation的获取
有3种方式可以获取到“当前interfaceOrientation”：
controller.interfaceOrientation，获取特定controller的方向
[[UIApplication sharedApplication] statusBarOrientation] 获取状态条相关的方向
[[UIDevice currentDevice] orientation] 获取当前设备的方向
25.SDWebimage
- setItem:(CustomItem *)item
{
_item = item;
// 占位图片
UIImage *placeholder = [UIImage imageNamed:@"placeholderImage"];
// 从内存\沙盒缓存中获得原图
UIImage *originalImage = [[SDImageCache sharedImageCache] imageFromDiskCacheForKey:item.originalImage];
if (originalImage) { // 如果内存\沙盒缓存有原图，那么就直接显示原图（不管现在是什么网络状态）
[self.imageView sd_setImageWithURL:[NSURL URLWithString:item.originalImage] placeholderImage:placeholder];
} else { // 内存\沙盒缓存没有原图
AFNetworkReachabilityManager *mgr = [AFNetworkReachabilityManager sharedManager];
if (mgr.isReachableViaWiFi) { // 在使用Wifi, 下载原图
[self.imageView sd_setImageWithURL:[NSURL URLWithString:item.originalImage] placeholderImage:placeholder];
} else if (mgr.isReachableViaWWAN) { // 在使用手机自带网络
// 用户的配置项假设利用NSUserDefaults存储到了沙盒中
// [[NSUserDefaults standardUserDefaults] setBool:NO forKey:@"alwaysDownloadOriginalImage"];
// [[NSUserDefaults standardUserDefaults] synchronize];
#warning 从沙盒中读取用户的配置项：在3G\4G环境是否仍然下载原图
BOOL alwaysDownloadOriginalImage = [[NSUserDefaults standardUserDefaults] boolForKey:@"alwaysDownloadOriginalImage"];
if (alwaysDownloadOriginalImage) { // 下载原图
[self.imageView sd_setImageWithURL:[NSURL URLWithString:item.originalImage] placeholderImage:placeholder];
} else { // 下载小图
[self.imageView sd_setImageWithURL:[NSURL URLWithString:item.thumbnailImage] placeholderImage:placeholder];
}
} else { // 没有网络
UIImage *thumbnailImage = [[SDImageCache sharedImageCache] imageFromDiskCacheForKey:item.thumbnailImage];
if (thumbnailImage) { // 内存\沙盒缓存中有小图
[self.imageView sd_setImageWithURL:[NSURL URLWithString:item.thumbnailImage] placeholderImage:placeholder];
} else {
[self.imageView sd_setImageWithURL:nil placeholderImage:placeholder];
}
}
}
}26.NSNumber转NSString可直接description
NSString *status = [json[@"status"] description];27.
// 主线程也会抽时间处理一下timer（不管主线程是否正在其他事件）
[[NSRunLoop mainRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];
28.
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