IOS开发基础知识--碎片25
1:使用@protocol实现delegate和datasource模式
#import <UIKit/UIKit.h> @protocol MyViewDataSource,MyViewDelegate; @interface myView : UIView<UIAlertViewDelegate> @property(nonatomic,assign)id<MyViewDelegate> myViewDelegate; @property(nonatomic,assign)id<MyViewDataSource> myViewDataSource; -(void)myShowAlert; @end @protocol MyViewDelegate <NSObject> @optional -(void)alertDidPop:(myView *)myView; -(void)alertConfirmShow:(myView *)myView clickedButtonAtIndex:(NSInteger)buttonIndex; @end @protocol MyViewDataSource <NSObject> @optional -(NSString *)textOfAlert:(myView *)myView; @required - (NSUInteger)numberOfItemsInMyView:(myView *)myView; @required @end
#import "myView.h" @implementation myView -(void)myShowAlert { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"测试实例" message:@"message" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定",nil]; alert.message = [self.myViewDataSource textOfAlert:self]; [alert show]; } - (void)didPresentAlertView:(UIAlertView *)alertView { [self.myViewDelegate alertDidPop:self]; } -(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex { [self.myViewDelegate alertConfirmShow:self clickedButtonAtIndex:buttonIndex]; } @end
使用方式：
#import "myView.h" @interface ViewController ()<MyViewDataSource,MyViewDelegate> @end
- (void)viewDidLoad { [super viewDidLoad]; myView *myVw = [[myView alloc]initWithFrame:CGRectMake(0, 0, 320, 460)]; myVw.myViewDataSource = self; myVw.myViewDelegate = self; [self.view addSubview:myVw]; [myVw myShowAlert]; }
代理实现的方法： - (void)alertDidPop:(UIView *)myView { myView.backgroundColor = [UIColor yellowColor]; } -(NSString *)textOfAlert:(myView *)myView { return @"信息"; } -(void)alertConfirmShow:(myView *)myView clickedButtonAtIndex:(NSInteger)buttonIndex { NSLog(@"你选中了%d",buttonIndex); }
2:动画 UIView animateWithDuration 使用详解
+ (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations + (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion + (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion
duration为动画持续的时间。animations为动画效果的代码块
可设动作属性：
- frame
- bounds
- center
- transform
- alpha
- backgroundColor
- contentStretch
例如一个视图淡出屏幕，另外一个视图出现的代码
[UIView animateWithDuration:1.0 animations:^{ firstView.alpha = 0.0; secondView.alpha = 1.0; }];
连续动画（可以在completion代码块中添加动画）：
[UIView animateWithDuration:2.0 animations:^{ oldImageView.alpha = 0.0; newImageView.alpha = 1.0; //imageView.center = CGPointMake(500.0, 512.0); } completion:^(BOOL finished){ [UIView animateWithDuration:4.0 animations:^{ newImageView.center = CGPointMake(500.0, 512.0); }]; }];
从上往下一个动作（默认是左上角，把要改变的值放在animations里）：
-(UIView *)myView { if (!_myView) { _myView=[[UIView alloc]initWithFrame:CGRectZero]; _myView.backgroundColor=[UIColor redColor]; } return _myView; } - (IBAction)BtnAction:(id)sender { self.myView.frame = CGRectMake(0,44, 320, 0); [self.view addSubview:self.myView]; [UIView animateWithDuration:0.3 animations:^{ self.myView.backgroundColor=[UIColor redColor]; self.myView.frame = CGRectMake(0,44, 320, 100); } completion:^(BOOL finished) { }]; }
3：UIView 的旋转和缩放
label.transform = CGAffineTransformMakeRotation(90 *M_PI / 180.0); //顺时针旋转 90度 label.transform = CGAffineTransformMakeRotation(180 *M_PI / 180.0); //顺时针 旋转180度 label.transform = CGAffineTransformMakeRotation(270 *M_PI / 180.0); //顺时针旋转270度 CGAffineTransform transform = label.transform; transform = CGAffineTransformScale(transform, 2,0.5);//前面的2表示横向放大2倍，后边的0.5表示纵向缩小一半 label.transform = transform;
4：加载歌词的代码实例
[ti:伤痕] [ar:曾敏杰] [al:] [by:] [offset:0] [00:00.11]伤痕 (Live) - 曾敏杰 [00:01.58]词：李宗盛 [00:02.41]曲：李宗盛 [00:03.28]键盘：刘卓/李海郡 [00:04.78]吉他：高飞/金天 [00:06.20]贝司：李九君 [00:07.29]鼓手：卢炜 [00:08.17]乐队总监：刘卓 [00:09.43]音响总监：金少刚 [00:11.01] [00:22.75]夜已深 还有什么人 [00:28.21]让你这样醒着数伤痕 [00:32.28] [00:33.09]为何临睡前会想要留一盏灯 [00:38.04]你若不肯说 我就不问 [00:42.07] [00:42.74]只是你现在不得不承认 [00:47.35] [00:47.93]爱情有时候是一种沉沦
歌词都是以lrc的文件内容，可以进行加载，然后对它进行处理；
@implementation WPFLyricParser + (NSArray *)parserLyricWithFileName:(NSString *)fileName { // 根据文件名称获取文件地址 NSString *path = [[NSBundle mainBundle] pathForResource:fileName ofType:nil]; // 根据文件地址获取转化后的总体的字符串 NSString *lyricStr = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:NULL]; // 将歌词总体字符串按行拆分开，每句都作为一个数组元素存放到数组中 NSArray *lineStrs = [lyricStr componentsSeparatedByString:@"\n"]; // 设置歌词时间正则表达式格式 NSString *pattern = @"\\[[0-9]{2}:[0-9]{2}.[0-9]{2}\\]"; NSRegularExpression *reg = [NSRegularExpression regularExpressionWithPattern:pattern options:0 error:NULL]; // 创建可变数组存放歌词模型 NSMutableArray *lyrics = [NSMutableArray array]; // 遍历歌词字符串数组 for (NSString *lineStr in lineStrs) { NSArray *results = [reg matchesInString:lineStr options:0 range:NSMakeRange(0, lineStr.length)]; // 歌词内容 NSTextCheckingResult *lastResult = [results lastObject]; NSString *content = [lineStr substringFromIndex:lastResult.range.location + lastResult.range.length]; // 每一个结果的range for (NSTextCheckingResult *result in results) { NSString *time = [lineStr substringWithRange:result.range]; #warning 对于 NSDateFormatter 类似的重大开小对象，最好使用单例管理 NSDateFormatter *formatter = [NSDateFormatter sharedDateFormatter]; formatter.dateFormat = @"[mm:ss.SS]"; NSDate *timeDate = [formatter dateFromString:time]; NSDate *initDate = [formatter dateFromString:@"[00:00.00]"]; // 创建模型 WPFLyric *lyric = [[WPFLyric alloc] init]; lyric.content = content; // 歌词的开始时间 lyric.time = [timeDate timeIntervalSinceDate:initDate]; // 将歌词对象添加到模型数组汇总 [lyrics addObject:lyric]; } } // 按照时间正序排序 NSSortDescriptor *sortDes = [NSSortDescriptor sortDescriptorWithKey:@"time" ascending:YES]; [lyrics sortUsingDescriptors:@[sortDes]]; return lyrics; } @end
5:UIWebView加载POST请求
NSURL *url = [NSURL URLWithString: @"http://your_url.com"]; NSString *body = [NSString stringWithFormat: @"arg1=%@&arg2=%@", @"val1",@"val2"]; NSMutableURLRequest *request = [[NSMutableURLRequest alloc]initWithURL: url]; [request setHTTPMethod: @"POST"]; [request setHTTPBody: [body dataUsingEncoding: NSUTF8StringEncoding]]; [webView loadRequest: request];
