默認不能輸入中文。
修改屬性Secure Text Entry爲不勾選狀態即可。
SZTextView 源碼如下：
//
// SZTextView.h
// SZTextView
//
// Created by glaszig on 14.03.13.
// Copyright (c) 2013 glaszig. All rights reserved.
//
#import <UIKit/UIKit.h>
@interface SZTextView : UITextView
@property (copy, nonatomic) NSString *placeholder;
@property (copy, nonatomic) NSAttributedString *attributedPlaceholder;
@property (retain, nonatomic) UIColor *placeholderTextColor UI_APPEARANCE_SELECTOR;
@end
//
// SZTextView.m
// SZTextView
//
// Created by glaszig on 14.03.13.
// Copyright (c) 2013 glaszig. All rights reserved.
//
#import "SZTextView.h"
#define HAS_TEXT_CONTAINER [self respondsToSelector:@selector(textContainer)]
#define HAS_TEXT_CONTAINER_INSETS(x) [(x) respondsToSelector:@selector(textContainerInset)]
@interface SZTextView ()
@property (strong, nonatomic) UITextView *_placeholderTextView;
@end
static NSString * const kAttributedPlaceholderKey = @"attributedPlaceholder";
static NSString * const kPlaceholderKey = @"placeholder";
static NSString * const kFontKey = @"font";
static NSString * const kAttributedTextKey = @"attributedText";
static NSString * const kTextKey = @"text";
static NSString * const kExclusionPathsKey = @"exclusionPaths";
static NSString * const kLineFragmentPaddingKey = @"lineFragmentPadding";
static NSString * const kTextContainerInsetKey = @"textContainerInset";
static NSString * const kTextAlignmentKey = @"textAlignment";
@implementation SZTextView
- (instancetype)initWithCoder:(NSCoder *)coder
{
self = [super initWithCoder:coder];
if (self) {
[self preparePlaceholder];
}
return self;
}
#if __IPHONE_OS_VERSION_MIN_REQUIRED >= 70000
- (instancetype)initWithFrame:(CGRect)frame textContainer:(NSTextContainer *)textContainer
{
self = [super initWithFrame:frame textContainer:textContainer];
if (self) {
[self preparePlaceholder];
}
return self;
}
#else
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self preparePlaceholder];
}
return self;
}
#endif
- (void)preparePlaceholder
{
NSAssert(!self._placeholderTextView, @"placeholder has been prepared already: %@", self._placeholderTextView);
// the label which displays the placeholder
// needs to inherit some properties from its parent text view
// account for standard UITextViewPadding
CGRect frame = self.bounds;
self._placeholderTextView = [[UITextView alloc] initWithFrame:frame];
self._placeholderTextView.opaque = NO;
self._placeholderTextView.backgroundColor = [UIColor clearColor];
self._placeholderTextView.textColor = [UIColor lightGrayColor];
self._placeholderTextView.textAlignment = self.textAlignment;
self._placeholderTextView.editable = NO;
self._placeholderTextView.scrollEnabled = NO;
self._placeholderTextView.userInteractionEnabled = NO;
self._placeholderTextView.font = self.font;
self._placeholderTextView.isAccessibilityElement = NO;
self._placeholderTextView.contentOffset = self.contentOffset;
self._placeholderTextView.contentInset = self.contentInset;
if ([self._placeholderTextView respondsToSelector:@selector(setSelectable:)]) {
self._placeholderTextView.selectable = NO;
}
if (HAS_TEXT_CONTAINER) {
self._placeholderTextView.textContainer.exclusionPaths = self.textContainer.exclusionPaths;
self._placeholderTextView.textContainer.lineFragmentPadding = self.textContainer.lineFragmentPadding;
}
if (HAS_TEXT_CONTAINER_INSETS(self)) {
self._placeholderTextView.textContainerInset = self.textContainerInset;
}
if (_attributedPlaceholder) {
self._placeholderTextView.attributedText = _attributedPlaceholder;
} else if (_placeholder) {
self._placeholderTextView.text = _placeholder;
}
[self setPlaceholderVisibleForText:self.text];
self.clipsToBounds = YES;
// some observations
NSNotificationCenter *defaultCenter = [NSNotificationCenter defaultCenter];
[defaultCenter addObserver:self selector:@selector(textDidChange:)
name:UITextViewTextDidChangeNotification object:self];
[self addObserver:self forKeyPath:kAttributedPlaceholderKey
options:NSKeyValueObservingOptionNew context:nil];
[self addObserver:self forKeyPath:kPlaceholderKey
options:NSKeyValueObservingOptionNew context:nil];
[self addObserver:self forKeyPath:kFontKey
options:NSKeyValueObservingOptionNew context:nil];
[self addObserver:self forKeyPath:kAttributedTextKey
options:NSKeyValueObservingOptionNew context:nil];
[self addObserver:self forKeyPath:kTextKey
options:NSKeyValueObservingOptionNew context:nil];
[self addObserver:self forKeyPath:kTextAlignmentKey
options:NSKeyValueObservingOptionNew context:nil];
if (HAS_TEXT_CONTAINER) {
[self.textContainer addObserver:self forKeyPath:kExclusionPathsKey
options:NSKeyValueObservingOptionNew context:nil];
[self.textContainer addObserver:self forKeyPath:kLineFragmentPaddingKey
options:NSKeyValueObservingOptionNew context:nil];
}
if (HAS_TEXT_CONTAINER_INSETS(self)) {
[self addObserver:self forKeyPath:kTextContainerInsetKey
options:NSKeyValueObservingOptionNew context:nil];
}
}
- (void)setPlaceholder:(NSString *)placeholderText
{
_placeholder = [placeholderText copy];
_attributedPlaceholder = [[NSAttributedString alloc] initWithString:placeholderText];
[self resizePlaceholderFrame];
}
- (void)setAttributedPlaceholder:(NSAttributedString *)attributedPlaceholderText
{
_placeholder = attributedPlaceholderText.string;
_attributedPlaceholder = [attributedPlaceholderText copy];
[self resizePlaceholderFrame];
}
- (void)layoutSubviews
{
[super layoutSubviews];
[self resizePlaceholderFrame];
}
- (void)resizePlaceholderFrame
{
CGRect frame = self._placeholderTextView.frame;
frame.size = self.bounds.size;
self._placeholderTextView.frame = frame;
}
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object
change:(NSDictionary *)change context:(void *)context
{
if ([keyPath isEqualToString:kAttributedPlaceholderKey]) {
self._placeholderTextView.attributedText = [change valueForKey:NSKeyValueChangeNewKey];
}
else if ([keyPath isEqualToString:kPlaceholderKey]) {
self._placeholderTextView.text = [change valueForKey:NSKeyValueChangeNewKey];
}
else if ([keyPath isEqualToString:kFontKey]) {
self._placeholderTextView.font = [change valueForKey:NSKeyValueChangeNewKey];
}
else if ([keyPath isEqualToString:kAttributedTextKey]) {
NSAttributedString *newAttributedText = [change valueForKey:NSKeyValueChangeNewKey];
[self setPlaceholderVisibleForText:newAttributedText.string];
}
else if ([keyPath isEqualToString:kTextKey]) {
NSString *newText = [change valueForKey:NSKeyValueChangeNewKey];
[self setPlaceholderVisibleForText:newText];
}
else if ([keyPath isEqualToString:kExclusionPathsKey]) {
self._placeholderTextView.textContainer.exclusionPaths = [change objectForKey:NSKeyValueChangeNewKey];
[self resizePlaceholderFrame];
}
else if ([keyPath isEqualToString:kLineFragmentPaddingKey]) {
self._placeholderTextView.textContainer.lineFragmentPadding = [[change objectForKey:NSKeyValueChangeNewKey] floatValue];
[self resizePlaceholderFrame];
}
else if ([keyPath isEqualToString:kTextContainerInsetKey]) {
NSValue *value = [change objectForKey:NSKeyValueChangeNewKey];
self._placeholderTextView.textContainerInset = value.UIEdgeInsetsValue;
}
else if ([keyPath isEqualToString:kTextAlignmentKey]) {
NSNumber *alignment = [change objectForKey:NSKeyValueChangeNewKey];
self._placeholderTextView.textAlignment = alignment.intValue;
}
else {
[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
}
}
- (void)setPlaceholderTextColor:(UIColor *)placeholderTextColor
{
self._placeholderTextView.textColor = placeholderTextColor;
}
- (UIColor *)placeholderTextColor
{
return self._placeholderTextView.textColor;
}
- (void)textDidChange:(NSNotification *)aNotification
{
[self setPlaceholderVisibleForText:self.text];
}
- (BOOL)becomeFirstResponder
{
[self setPlaceholderVisibleForText:self.text];
return [super becomeFirstResponder];
}
- (void)setPlaceholderVisibleForText:(NSString *)text
{
if (text.length < 1) {
[self addSubview:self._placeholderTextView];
[self sendSubviewToBack:self._placeholderTextView];
} else {
[self._placeholderTextView removeFromSuperview];
}
}
- (void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self];
[self removeObserver:self forKeyPath:kAttributedPlaceholderKey];
[self removeObserver:self forKeyPath:kPlaceholderKey];
[self removeObserver:self forKeyPath:kFontKey];
[self removeObserver:self forKeyPath:kAttributedTextKey];
[self removeObserver:self forKeyPath:kTextKey];
[self removeObserver:self forKeyPath:kTextAlignmentKey];
if (HAS_TEXT_CONTAINER) {
[self.textContainer removeObserver:self forKeyPath:kExclusionPathsKey];
[self.textContainer removeObserver:self forKeyPath:kLineFragmentPaddingKey];
}
if (HAS_TEXT_CONTAINER_INSETS(self)) {
[self removeObserver:self forKeyPath:kTextContainerInsetKey];
}
}
@end