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QMUITextField.m
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245 lines (192 loc) · 9.57 KB
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//
// QMUITextField.m
// qmui
//
// Created by MoLice on 16-11-03
// Copyright (c) 2016年 QMUI Team. All rights reserved.
//
#import "QMUITextField.h"
#import "QMUICore.h"
#import "NSString+QMUI.h"
#import "UITextField+QMUI.h"
@interface QMUITextField () <QMUITextFieldDelegate, UIScrollViewDelegate>
@property(nonatomic, weak) id <QMUITextFieldDelegate> originalDelegate;
@end
@implementation QMUITextField
@dynamic delegate;
- (instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
[self didInitialized];
self.tintColor = TextFieldTintColor;
}
return self;
}
- (instancetype)initWithCoder:(NSCoder *)aDecoder {
if (self = [super initWithCoder:aDecoder]) {
[self didInitialized];
}
return self;
}
- (void)didInitialized {
self.delegate = self;
self.placeholderColor = UIColorPlaceholder;
self.textInsets = TextFieldTextInsets;
self.shouldResponseToProgrammaticallyTextChanges = YES;
self.maximumTextLength = NSUIntegerMax;
[self addTarget:self action:@selector(handleTextChangeEvent:) forControlEvents:UIControlEventEditingChanged];
}
- (void)dealloc {
self.delegate = nil;
self.originalDelegate = nil;
}
#pragma mark - Placeholder
- (void)setPlaceholderColor:(UIColor *)placeholderColor {
_placeholderColor = placeholderColor;
if (self.placeholder) {
[self updateAttributedPlaceholderIfNeeded];
}
}
- (void)setPlaceholder:(NSString *)placeholder {
[super setPlaceholder:placeholder];
if (self.placeholderColor) {
[self updateAttributedPlaceholderIfNeeded];
}
}
- (void)updateAttributedPlaceholderIfNeeded {
self.attributedPlaceholder = [[NSAttributedString alloc] initWithString:self.placeholder attributes:@{NSForegroundColorAttributeName: self.placeholderColor}];
}
#pragma mark - TextInsets
- (CGRect)textRectForBounds:(CGRect)bounds {
bounds = CGRectInsetEdges(bounds, self.textInsets);
CGRect resultRect = [super textRectForBounds:bounds];
return resultRect;
}
- (CGRect)editingRectForBounds:(CGRect)bounds {
bounds = CGRectInsetEdges(bounds, self.textInsets);
return [super editingRectForBounds:bounds];
}
#pragma mark - TextPosition
- (void)layoutSubviews {
[super layoutSubviews];
// 以下代码修复系统的 UITextField 在 iOS 10 下的 bug：https://github.com/QMUI/QMUI_iOS/issues/64
if (IOS_VERSION < 10.0) {
return;
}
UIScrollView *scrollView = self.subviews.firstObject;
if (![scrollView isKindOfClass:[UIScrollView class]]) {
return;
}
// 默认 delegate 是为 nil 的，所以我们才利用 delegate 修复这 个 bug，如果哪一天 delegate 不为 nil，就先不处理了。
if (scrollView.delegate) {
return;
}
scrollView.delegate = self;
}
#pragma mark - <UIScrollViewDelegate>
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
// 以下代码修复系统的 UITextField 在 iOS 10 下的 bug：https://github.com/QMUI/QMUI_iOS/issues/64
if (scrollView != self.subviews.firstObject) {
return;
}
CGFloat lineHeight = ((NSParagraphStyle *)self.defaultTextAttributes[NSParagraphStyleAttributeName]).minimumLineHeight;
lineHeight = lineHeight ?: ((UIFont *)self.defaultTextAttributes[NSFontAttributeName]).lineHeight;
if (scrollView.contentSize.height > ceil(lineHeight) && scrollView.contentOffset.y < 0) {
scrollView.contentOffset = CGPointMake(scrollView.contentOffset.x, 0);
}
}
- (void)setText:(NSString *)text {
NSString *textBeforeChange = self.text;
[super setText:text];
if (self.shouldResponseToProgrammaticallyTextChanges && ![textBeforeChange isEqualToString:text]) {
[self fireTextDidChangeEventForTextField:self];
}
}
- (void)setAttributedText:(NSAttributedString *)attributedText {
NSAttributedString *textBeforeChange = self.attributedText;
[super setAttributedText:attributedText];
if (self.shouldResponseToProgrammaticallyTextChanges && ![textBeforeChange isEqualToAttributedString:attributedText]) {
[self fireTextDidChangeEventForTextField:self];
}
}
- (void)fireTextDidChangeEventForTextField:(QMUITextField *)textField {
[textField sendActionsForControlEvents:UIControlEventEditingChanged];
[[NSNotificationCenter defaultCenter] postNotificationName:UITextFieldTextDidChangeNotification object:textField];
}
- (NSUInteger)lengthWithString:(NSString *)string {
return self.shouldCountingNonASCIICharacterAsTwo ? string.qmui_lengthWhenCountingNonASCIICharacterAsTwo : string.length;
}
#pragma mark - <QMUITextFieldDelegate>
- (BOOL)textField:(QMUITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
if (textField.maximumTextLength < NSUIntegerMax) {
// 如果是中文输入法正在输入拼音的过程中（markedTextRange 不为 nil），是不应该限制字数的（例如输入“huang”这5个字符，其实只是为了输入“黄”这一个字符），所以在 shouldChange 这里不会限制，而是放在 didChange 那里限制。
BOOL isDeleting = range.length > 0 && string.length <= 0;
if (isDeleting || textField.markedTextRange) {
if ([textField.originalDelegate respondsToSelector:_cmd]) {
return [textField.originalDelegate textField:textField shouldChangeCharactersInRange:range replacementString:string];
}
return YES;
}
NSUInteger rangeLength = self.shouldCountingNonASCIICharacterAsTwo ? [textField.text substringWithRange:range].qmui_lengthWhenCountingNonASCIICharacterAsTwo : range.length;
if ([self lengthWithString:textField.text] - rangeLength + [self lengthWithString:string] > textField.maximumTextLength) {
// 将要插入的文字裁剪成这么长，就可以让它插入了
NSInteger substringLength = textField.maximumTextLength - [self lengthWithString:textField.text] + rangeLength;
if (substringLength > 0 && [self lengthWithString:string] > substringLength) {
NSString *allowedText = [string qmui_substringAvoidBreakingUpCharacterSequencesWithRange:NSMakeRange(0, substringLength) lessValue:YES countingNonASCIICharacterAsTwo:self.shouldCountingNonASCIICharacterAsTwo];
if ([self lengthWithString:allowedText] <= substringLength) {
textField.text = [textField.text stringByReplacingCharactersInRange:range withString:allowedText];
if (!textField.shouldResponseToProgrammaticallyTextChanges) {
[textField fireTextDidChangeEventForTextField:textField];
}
}
}
if ([self.originalDelegate respondsToSelector:@selector(textField:didPreventTextChangeInRange:replacementString:)]) {
[self.originalDelegate textField:textField didPreventTextChangeInRange:range replacementString:string];
}
return NO;
}
}
if ([textField.originalDelegate respondsToSelector:_cmd]) {
return [textField.originalDelegate textField:textField shouldChangeCharactersInRange:range replacementString:string];
}
return YES;
}
#pragma mark - Delegate Proxy
- (void)setDelegate:(id<QMUITextFieldDelegate>)delegate {
self.originalDelegate = delegate != self ? delegate : nil;
[super setDelegate:delegate ? self : nil];
}
- (NSMethodSignature *)methodSignatureForSelector:(SEL)aSelector {
NSMethodSignature *a = [super methodSignatureForSelector:aSelector];
NSMethodSignature *b = [(id)self.originalDelegate methodSignatureForSelector:aSelector];
NSMethodSignature *result = a ? a : b;
return result;
}
- (void)forwardInvocation:(NSInvocation *)anInvocation {
if ([(id)self.originalDelegate respondsToSelector:anInvocation.selector]) {
[anInvocation invokeWithTarget:(id)self.originalDelegate];
}
}
- (BOOL)respondsToSelector:(SEL)aSelector {
// 修复 iOS 7 下将 UITextField.delegate 指向自身时会死循环的问题
if (IOS_VERSION < 8.0 && [NSStringFromSelector(aSelector) hasPrefix:@"customOverlayC"]) {
return NO;
}
BOOL a = [super respondsToSelector:aSelector];
BOOL c = [self.originalDelegate respondsToSelector:aSelector];
BOOL result = a || c;
return result;
}
- (void)handleTextChangeEvent:(QMUITextField *)textField {
// 1、iOS 10 以下的版本，从中文输入法的候选词里选词输入，是不会走到 textField:shouldChangeCharactersInRange:replacementString: 的，所以要在这里截断文字
// 2、如果是中文输入法正在输入拼音的过程中（markedTextRange 不为 nil），是不应该限制字数的（例如输入“huang”这5个字符，其实只是为了输入“黄”这一个字符），所以在 shouldChange 那边不会限制，而是放在 didChange 这里限制。
if (!textField.markedTextRange) {
if ([self lengthWithString:textField.text] > textField.maximumTextLength) {
textField.text = [textField.text qmui_substringAvoidBreakingUpCharacterSequencesWithRange:NSMakeRange(0, textField.maximumTextLength) lessValue:YES countingNonASCIICharacterAsTwo:self.shouldCountingNonASCIICharacterAsTwo];
if ([self.originalDelegate respondsToSelector:@selector(textField:didPreventTextChangeInRange:replacementString:)]) {
[self.originalDelegate textField:textField didPreventTextChangeInRange:textField.qmui_selectedRange replacementString:nil];
}
}
}
}
@end