iphone - 如何在 iPhone 中放大和缩小 TextView ？

Question

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Answer 1

当你可以增加 UITextView 委托(delegate)上的字体大小时，缩放 UITextView 是没有意义的。

UITextView *textView = [UITextView alloc] initWithFrame:CGRectMake(0, 0, 320, 200)];
UIPinchGestureRecognizer *gestureRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(changeFontSize:)];
[textView addGestureRecognizer:gestureRecognizer];

- (void)changeFontSize:(UIPinchGestureRecognizer *)gestureRecognizer {
    UITextView *textView = (UITextView *)gestureRecognizer.view;
    float yourFontSize = gestureRecognizer.scale * FONT_SIZE;
    textView.font = [UIFont systemFontOfSize:yourFontSize];
}