UILabel 如何设置按照字节换行

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tipLabel.lineBreakMode = NSLineBreakByCharWrapping;
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typedef NS_ENUM(NSInteger, NSLineBreakMode) {
    NSLineBreakByWordWrapping = 0,         // Wrap at word boundaries, default
    NSLineBreakByCharWrapping,        // Wrap at character boundaries
    NSLineBreakByClipping,        // Simply clip
    NSLineBreakByTruncatingHead,    // Truncate at head of line: "...wxyz"
    NSLineBreakByTruncatingTail,    // Truncate at tail of line: "abcd..."
    NSLineBreakByTruncatingMiddle    // Truncate middle of line:  "ab...yz"
} API_AVAILABLE(macos(10.0), ios(6.0), watchos(2.0), tvos(9.0));