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(, , , )];
    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(,, , );
    [self.view addSubview:self.myView];
    [UIView animateWithDuration:0.3 animations:^{
        self.myView.backgroundColor=[UIColor redColor];
        self.myView.frame = CGRectMake(,, , );

    } completion:^(BOOL finished) {

    }];
}

3：UIView 的旋转和缩放

 label.transform = CGAffineTransformMakeRotation( *M_PI / 180.0);

//顺时针旋转 90度

 label.transform = CGAffineTransformMakeRotation( *M_PI / 180.0);

//顺时针 旋转180度

 label.transform = CGAffineTransformMakeRotation( *M_PI / 180.0);

//顺时针旋转270度

CGAffineTransform transform = label.transform;

transform = CGAffineTransformScale(transform, ,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:]
[:00.11]伤痕 (Live) - 曾敏杰
[:01.58]词：李宗盛
[:02.41]曲：李宗盛
[:03.28]键盘：刘卓/李海郡
[:04.78]吉他：高飞/金天
[:06.20]贝司：李九君
[:07.29]鼓手：卢炜
[:08.17]乐队总监：刘卓
[:09.43]音响总监：金少刚
[:11.01]
[:22.75]夜已深 还有什么人
[:28.21]让你这样醒着数伤痕
[:32.28]
[:33.09]为何临睡前会想要留一盏灯
[:38.04]你若不肯说 我就不问
[:42.07]
[:42.74]只是你现在不得不承认
[:47.35]
[: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: 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: range:NSMakeRange(, 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];