16.UILabel 和 UIImageView

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UILabel

    UILabel *label = [[UILabel alloc] init];
    label.frame = CGRectMake(10, 100, 300, 300);
    label.backgroundColor = [UIColor yellowColor];
    label.text = @"It's a label.It's a label.It's a label.It's a label.It's a label.It's a label.It's a label.It's a label.It's a label.It's a label.It's a label.It's a label.It's a label.It's a label.It's a label.It's a label.It's a label.It's a label.It's a label.It's a label.It's a label.It's a label.It's a label.It's a label.It's a label.It's a label.It's a label.It's a label.";
    label.textAlignment = NSTextAlignmentCenter;  // 文字排版
    label.textColor = [UIColor colorWithRed:0.3 green:0.4 blue:0.9 alpha:1];
    label.alpha = 0.5;
//    label.font = [UIFont systemFontOfSize:25];
//    label.font = [UIFont boldSystemFontOfSize:25];
    label.font = [UIFont fontWithName:@"Bodoni 72" size:15];
//    label.shadowColor = [UIColor darkGrayColor];  // 阴影颜色
//    label.shadowOffset = CGSizeMake(10, 10);  // 阴影偏移
//    label.lineBreakMode = NSLineBreakByCharWrapping;  // 换行模式
    label.lineBreakMode = NSLineBreakByWordWrapping;
//    label.numberOfLines = 10;
    label.numberOfLines = 0;
    [self.view addSubview:label];

UIImageView

    NSString *path = [[NSBundle mainBundle] resourcePath];
    NSString *imagePath = [NSString stringWithFormat:@"%@/1.png",path];
    UIImage *image = [[UIImage alloc] initWithContentsOfFile:imagePath];  // 会自动释放内存
    
    UIImage *image1 = [UIImage imageNamed:@"1"];  // 存在缓存中，运行结束后释放
    
    UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
    imageView.frame = CGRectMake(10, 100, 355, 400);
    imageView.backgroundColor = [UIColor yellowColor];
    [self.view addSubview:imageView];
    
    imageView.contentMode = UIViewContentModeCenter;  // 内容居中
    
    // imageView动画 - 播放序列图
    NSMutableArray *imageArray = [[NSMutableArray alloc] init];
    for (int i=1; i<=13; i++) {
        UIImage *image = [UIImage imageNamed: [NSString stringWithFormat:@"png%d",i]];
        [imageArray addObject:image];
    }
    
    UIImageView *imageView1 = [[UIImageView alloc] init];
    imageView1.frame = CGRectMake(0, 100, 407, 217);
    [self.view addSubview:imageView1];
    imageView.animationImages = imageArray;  // 设置图片数组
    imageView.animationDuration = 2;  // 设置播放周期时间
    imageView.animationRepeatCount = 10; // 执行次数
    [imageView startAnimating];  // 开始播放动画

图像的转化和保存

    UIImage *image = [UIImage imageNamed:@"j1.jpg"];
    NSData *data = UIImagePNGRepresentation(image);
    UIImage *pngimage = [UIImage imageWithData:data];
    UIImageWriteToSavedPhotosAlbum(pngimage, nil, nil, nil);  // 保存至系统相册 需要申请权限