代码如下：
UITextView *testView = [UITextView new];
testView.textContainer.lineFragmentPadding = 0;
testView.textContainerInset = UIEdgeInsetsZero;
[......]
iOS中UITextView上下左右有默认padding的解决方法
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代码如下：
UITextView *testView = [UITextView new];
testView.textContainer.lineFragmentPadding = 0;
testView.textContainerInset = UIEdgeInsetsZero;
[......]