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iOS NSURL URLWithString 与 fileURLWithPath 区别 - URLWithString 与 fileURLWithPath 的区别在于前者用于网络，后者用于本地 NSURL *appURL = [NSURLURLWithString:urlString]; //网络url NS...

iOS NSString 创建和初始化 + (instancetype)string; + (instancetype)stringWithString:(NSString *)string; + (instancetype)stringWithCharacters:(const unichar *)characters length:(NSUI...

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iOS NSString 替换字符串 - (NSString *)stringByReplacingOccurrencesOfString:(NSString *)target withString:(NSString *)replacement options:(NSStringCompareOptions)options range:(NSRa...

AVFoundation – 将多个媒体合并(四) – 不同分辨率媒体合成并自定义分辨率 AVAsset 加载媒体 AVAssetTrack 获取视频 音频信息 AVMetadataItem 获取媒体属性元数据 AVAssetImageGenerator 截图 ...

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