iOS學習 - 23 載入本地 txt文件，NSMutableParagraphStyle 段落格式，縮放動畫

思路：

　　1.new 一個 Empty 尾碼為 .txt 文件，內容隨筆拷貝一段

　　2.用 NSString 接收本地文件，再用一個標題拼接字元串

　　3.創建一個 NSMutableParagraphStyle 實例，設置標題居中、標題距離正文間隔

　　4.創建一個 NSMutableParagraphStyle 實例，設置正文左對齊、每段開頭縮進 10

　　5.創建一個基礎動畫的實例，用代理監聽動畫結束

話不多說上代碼

#pragma mark -- 拼接字元
- (void)loadData:(NSString *)filename {
    
    //第一個段落
    NSMutableParagraphStyle *first = [[NSMutableParagraphStyle alloc]init];
    first.alignment = NSTextAlignmentCenter;
    first.lineSpacing = 10;
    
    //第二個段落
    NSMutableParagraphStyle *second = [[NSMutableParagraphStyle alloc]init];
    //從左開始寫
    second.alignment = NSTextAlignmentLeft;
    //首行縮進
    second.firstLineHeadIndent = 10;
    //間距
    second.lineSpacing = 10;
    
    UIFont *titleFont = [UIFont systemFontOfSize:16];
    UIFont *contextFont = [UIFont systemFontOfSize:13];
    
    NSMutableAttributedString *str1 = [[NSMutableAttributedString alloc]initWithString:@"游戲許可及服務協議" attributes:@{NSParagraphStyleAttributeName:first,NSFontAttributeName:titleFont}];
    
    //標題拼接正文，正文前加換行符
    NSString *str = [NSString stringWithFormat:@"\n%@",filename];
    
    NSMutableAttributedString *str2 = [[NSMutableAttributedString alloc]initWithString:str attributes:@{NSParagraphStyleAttributeName:second,NSFontAttributeName:contextFont}];
    
    [str1 appendAttributedString:str2];
    _textView.attributedText = str1;
}

#pragma mark -- 關閉動畫
- (void)closeAniamtion:(UIView *)view {
    CABasicAnimation *animation = [CABasicAnimation animation];
    animation.keyPath = @"transform.scale";
    animation.toValue = @0.9;
    animation.duration = 0.4;
    animation.delegate = self;
    animation.removedOnCompletion = NO;
    animation.fillMode = kCAFillModeForwards;
    [view.layer addAnimation:animation forKey:@"closeAnimation"];
}

#pragma mark -- 本地 txt 文件內容
- (NSString *)filename {
    //本地 txt 文件
    NSString *path = [[NSBundle mainBundle]pathForResource:@"淺遇時光，靜好無恙.txt" ofType:nil];
    //取出內容
    NSString *filename = [[NSString alloc]initWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
    return filename;
}

#pragma mark -- 代理監聽動畫停止
- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag {

    if ([_bgView.layer animationForKey:@"closeAnimation"] == anim) {
        [_bgView removeFromSuperview];
    }
}

完整代碼在 github 上，點我下載