1、自动撑满宽度
_textField.adjustsFontSizeToFitWidth = YES;
_textField.minimumFontSize = 20;
2、编辑时向左偏移
1、UITextField 一共有如下几个View 组成:UIFieldEditor、UITextFieldContentView、UITextFieldRoundedRectBackgroundViewNeue、UITextField,对应的frame 分别为:
<UIFieldEditor; frame = (7 2; 146 26);
<_UITextFieldContentView; frame = (0 -3.5; 150 35.5);
<_UITextFieldRoundedRectBackgroundViewNeue; frame = (0 0; 160 30);
<UITextField; frame = (123.5 89.5; 160 30);
2、编辑时 是在 UIFieldEditor,继承自UIScrollView,修改contentOffset 即可搞定 向左向下的偏移
3、重新 layoutSubviews
- (void)layoutSubviews {
[super layoutSubviews];
for (UIScrollView *fieldEditor in self.textField.subviews) {
if ([fieldEditor isKindOfClass:[UIScrollView class]]) { // UIFieldEditor
CGFloat currentXOffset = 0.0f;
for (UIView *fieldEditorContentView in fieldEditor.subviews) { //_FieldEditorContentView
currentXOffset = fieldEditorContentView.frame.origin.x;
if (_defaultXOffset == 0.0f && currentXOffset != 0.0f) {
_defaultXOffset = currentXOffset;
}
}
CGPoint offset = fieldEditor.contentOffset;
if (currentXOffset == 0.0f && _defaultXOffset != 0.0f) {
offset.x = -_defaultXOffset;
} else {
offset.x = 0.0f;
}
if (self.textField.text.length == 0) { //字体为空时重置_defaultXOffset
offset.x = 0.0f;
_defaultXOffset = 0.0f;
}
fieldEditor.contentOffset = offset;
break;
}
}
}
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