PlaceholderTextView，textviewplaceholder

PlaceholderTextView，textviewplaceholder

PlaceholderTextView

 

 效果

 

源碼

https://github.com/YouXianMing/UI-Component-Collection 的 PlaceholderTextView

////  PlaceholderTextView.h//  PlaceholderTextView////  Created by YouXianMing on 16/7/18.//  Copyright © 2016年 YouXianMing. All rights reserved.//#import <UIKit/UIKit.h>@class PlaceholderTextView;@protocol PlaceholderTextViewDelegate <NSObject>@optional/** *  Asks the delegate if editing should begin in the specified text view. * *  @param textView PlaceholderTextView's object. * *  @return YEStrue if an editing session should be initiated; otherwise, NOfalse to disallow editing. */- (BOOL)placeholderTextViewShouldBeginEditing:(PlaceholderTextView *)textView;/** *  Asks the delegate if editing should stop in the specified text view. * *  @param textView PlaceholderTextView's object. * *  @return YEStrue if editing should stop; otherwise, NOfalse if the editing session should continue */- (BOOL)placeholderTextViewShouldEndEditing:(PlaceholderTextView *)textView;/** *  Tells the delegate that editing of the specified text view has begun. * *  @param textView PlaceholderTextView's object. */- (void)placeholderTextViewDidBeginEditing:(PlaceholderTextView *)textView;/** *  Tells the delegate that editing of the specified text view has ended. * *  @param textView PlaceholderTextView's object. */- (void)placeholderTextViewDidEndEditing:(PlaceholderTextView *)textView;/** *  Asks the delegate whether the specified text should be replaced in the text view. * *  @param textView PlaceholderTextView's object. * *  @return YEStrue if the old text should be replaced by the new text; NOfalse if the replacement operation should be aborted. */- (BOOL)placeholderTextShouldChangeText:(PlaceholderTextView *)textView;@end@interface PlaceholderTextView : UIView/** *  PlaceholderTextView's delegate. */@property (nonatomic, weak) id <PlaceholderTextViewDelegate> delegate;/** *  Current string. */@property (nonatomic, strong, readonly) NSString *currentString;#pragma mark - UITextView related./** *  The TextView. */@property (nonatomic, strong, readonly) UITextView   *textView;/** *  The textView's containerInset. */@property (nonatomic) UIEdgeInsets  textContainerInset;#pragma mark - Placeholder related./** *  Placeholder attributed string. */@property (nonatomic, strong) NSAttributedString *attributedPlaceholder;/** *  PlaceHorderString gap from left. */@property (nonatomic) CGFloat placeHorderLeftEdge;/** *  PlaceHorderString gap from top. */@property (nonatomic) CGFloat placeHorderTopEdge;#pragma mark - PlaceholderTextView's event./** * PlaceholderTextView resign first responder. */- (void)placeholderTextViewResignFirstResponder;/** *  PlaceholderTextView become first responder. */- (void)placeholderTextViewbecomeFirstResponder;@end

////  PlaceholderTextView.m//  PlaceholderTextView////  Created by YouXianMing on 16/7/18.//  Copyright © 2016年 YouXianMing. All rights reserved.//#import "PlaceholderTextView.h"@interface PlaceholderTextView () <UITextViewDelegate>@property (nonatomic, strong) UITextField *textField;@property (nonatomic, strong) UITextView  *textView;@property (nonatomic, strong) NSString    *currentString;@end@implementation PlaceholderTextView#pragma mark - Frame related method.- (void)layoutSubviews {    [super layoutSubviews];        self.textView.frame = self.bounds;    [self resetPlaceHorderFrame];}- (instancetype)initWithFrame:(CGRect)frame {        if (self = [super initWithFrame:frame]) {                self.textField             = [[UITextField alloc] init];        self.textField.enabled     = NO;        self.textField.textColor   = [UIColor clearColor];        [self addSubview:self.textField];                self.textView                 = [[UITextView alloc] initWithFrame:self.bounds];        self.textView.delegate        = self;        self.textView.backgroundColor = [UIColor clearColor];        self.textView.textColor       = [UIColor grayColor];        [self addSubview:self.textView];    }        return self;}#pragma mark - FirstResponder related.- (void)placeholderTextViewResignFirstResponder {    [self.textView resignFirstResponder];}- (void)placeholderTextViewbecomeFirstResponder {    [self.textView becomeFirstResponder];}#pragma mark - UITextViewDelegate- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {        NSString *currentText = [textView.text stringByReplacingCharactersInRange:range withString:text];    self.textField.text   = currentText;    self.currentString    = currentText;        if (self.delegate && [self.delegate respondsToSelector:@selector(placeholderTextShouldChangeText:)]) {                return [self.delegate placeholderTextShouldChangeText:self];            } else {            return YES;    }}- (BOOL)textViewShouldBeginEditing:(UITextView *)textView {    if (self.delegate && [self.delegate respondsToSelector:@selector(placeholderTextViewShouldBeginEditing:)]) {                return [self.delegate placeholderTextViewShouldBeginEditing:self];            } else {            return YES;    }}- (BOOL)textViewShouldEndEditing:(UITextView *)textView {    if (self.delegate && [self.delegate respondsToSelector:@selector(placeholderTextViewShouldEndEditing:)]) {                return [self.delegate placeholderTextViewShouldEndEditing:self];            } else {            return YES;    }}- (void)textViewDidBeginEditing:(UITextView *)textView {    if (self.delegate && [self.delegate respondsToSelector:@selector(placeholderTextViewDidBeginEditing:)]) {                [self.delegate placeholderTextViewDidBeginEditing:self];    }}- (void)textViewDidEndEditing:(UITextView *)textView {    if (self.delegate && [self.delegate respondsToSelector:@selector(placeholderTextViewDidEndEditing:)]) {                [self.delegate placeholderTextViewDidEndEditing:self];    }}#pragma mark - PlaceHorder related- (void)resetPlaceHorderFrame {    self.textField.attributedPlaceholder = _attributedPlaceholder;    [self.textField sizeToFit];        CGRect newFrame      = self.textField.frame;    newFrame.origin.x    = _placeHorderLeftEdge;    newFrame.origin.y    = _placeHorderTopEdge;    self.textField.frame = newFrame;}#pragma mark - Setter & Getter- (void)setTextContainerInset:(UIEdgeInsets)textContainerInset {    _textContainerInset          = textContainerInset;    _textView.textContainerInset = textContainerInset;}- (void)setPlaceHorderLeftEdge:(CGFloat)placeHorderLeftEdge {    _placeHorderLeftEdge = placeHorderLeftEdge;    [self resetPlaceHorderFrame];}- (void)setPlaceHorderTopEdge:(CGFloat)placeHorderTopEdge {    _placeHorderTopEdge = placeHorderTopEdge;    [self resetPlaceHorderFrame];}- (void)setAttributedPlaceholder:(NSAttributedString *)attributedPlaceholder {    _attributedPlaceholder = attributedPlaceholder;    [self resetPlaceHorderFrame];}@end

////  PlaceholderTextView+ConvenientSetup.h//  PlaceholderTextView////  Created by YouXianMing on 16/7/18.//  Copyright © 2016年 YouXianMing. All rights reserved.//#import "PlaceholderTextView.h"@interface PlaceholderTextView (ConvenientSetup)/** *  PlaceholderTextView's placeholderString setup. * *  @param string   The placeholderString. *  @param font     Font. *  @param color    Color. *  @param leftEdge Gap from left. *  @param topEdge  Gap from top. */- (void)placeholderString:(NSString *)string font:(UIFont *)font color:(UIColor *)color leftEdge:(CGFloat)leftEdge topEdge:(CGFloat)topEdge;/** *  PlaceholderTextView's textView setup. * *  @param font           Font. *  @param color          Color. *  @param containerInset TextContainerInset. */- (void)textViewFont:(UIFont *)font color:(UIColor *)color containerInset:(UIEdgeInsets)containerInset;/** *  Create the InputAccessoryView with the specified heigh. * *  @param height The view's height. * *  @return InputAccessoryView. */- (UIView *)createInputAccessoryViewWithViewHeight:(CGFloat)height;@end

////  PlaceholderTextView+ConvenientSetup.m//  PlaceholderTextView////  Created by YouXianMing on 16/7/18.//  Copyright © 2016年 YouXianMing. All rights reserved.//#import "PlaceholderTextView+ConvenientSetup.h"@implementation PlaceholderTextView (ConvenientSetup)- (void)placeholderString:(NSString *)string font:(UIFont *)font color:(UIColor *)color leftEdge:(CGFloat)leftEdge topEdge:(CGFloat)topEdge {        NSParameterAssert(string);    NSParameterAssert(font);    NSParameterAssert(color);        NSString                  *placeHorderString = string;    NSMutableAttributedString *attributeString   = [[NSMutableAttributedString alloc] initWithString:placeHorderString];    [attributeString addAttribute:NSFontAttributeName value:font range:NSMakeRange(0, placeHorderString.length)];    [attributeString addAttribute:NSForegroundColorAttributeName value:color range:NSMakeRange(0, placeHorderString.length)];        self.placeHorderLeftEdge   = leftEdge;    self.placeHorderTopEdge    = topEdge;    self.attributedPlaceholder = attributeString;}- (void)textViewFont:(UIFont *)font color:(UIColor *)color containerInset:(UIEdgeInsets)containerInset {    self.textView.font      = font;    self.textView.textColor = color;    self.textContainerInset = containerInset;}- (UIView *)createInputAccessoryViewWithViewHeight:(CGFloat)height {    UIView *inputAccessoryView         = [[UIView alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, height)];    inputAccessoryView.backgroundColor = [UIColor clearColor];    self.textView.inputAccessoryView   = inputAccessoryView;        return inputAccessoryView;}@end

////  ViewController.m//  PlaceholderTextView////  Created by YouXianMing on 16/7/18.//  Copyright © 2016年 YouXianMing. All rights reserved.//#import "ViewController.h"#import "PlaceholderTextView.h"#import "PlaceholderTextView+ConvenientSetup.h"@interface ViewController () <PlaceholderTextViewDelegate> {        PlaceholderTextView *_textView;}@end@implementation ViewController- (void)viewDidLoad {        [super viewDidLoad];        UIColor *grayColor  = [UIColor grayColor];    UIColor *textColor  = [[UIColor blackColor] colorWithAlphaComponent:0.95f];    UIColor *whiteColor = [UIColor whiteColor];    UIFont  *font_16    = [UIFont systemFontOfSize:16.f];        // Add UITapGestureRecognizer.    UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(gestureEvent)];    [self.view addGestureRecognizer:tapGesture];        // Create PlaceholderTextView.    _textView                   = [[PlaceholderTextView alloc] initWithFrame:CGRectMake(0, 20, 320, 180)];    _textView.layer.borderWidth = 0.5f;    _textView.delegate          = self;    [self.view addSubview:_textView];        // Set placeholderString.    [_textView placeholderString:@"請輸入您的評價(少於50字)" font:font_16 color:grayColor leftEdge:19.f topEdge:15.f];        // Set textView.    [_textView textViewFont:font_16 color:textColor containerInset:UIEdgeInsetsMake(15.f, 15.f, 15.f, 15.f)];        // Create inputAccessoryView.    UIView *inputAccessoryView         = [_textView createInputAccessoryViewWithViewHeight:40.f];    inputAccessoryView.backgroundColor = grayColor;        // Setup inputAccessoryView.    UIButton *button       = [[UIButton alloc] initWithFrame:inputAccessoryView.bounds];    button.titleLabel.font = [UIFont systemFontOfSize:14.f];    [button setTitle:@"確定" forState:UIControlStateNormal];    [button setTitleColor:whiteColor forState:UIControlStateNormal];    [button setTitleColor:[whiteColor colorWithAlphaComponent:0.5f] forState:UIControlStateHighlighted];    [button addTarget:self action:@selector(inputAccessoryViewEvent) forControlEvents:UIControlEventTouchUpInside];    [inputAccessoryView addSubview:button];}#pragma mark - Event related.- (void)inputAccessoryViewEvent {        [_textView placeholderTextViewResignFirstResponder];}- (void)gestureEvent {    [self.view endEditing:YES];}#pragma mark - PlaceholderTextViewDelegate- (BOOL)placeholderTextShouldChangeText:(PlaceholderTextView *)textView {        NSLog(@"--> %@", textView.currentString);    BOOL result; textView.currentString.length >= 50 ? (result = NO) : (result = YES);    return result;}- (BOOL)placeholderTextViewShouldBeginEditing:(PlaceholderTextView *)textView {        NSLog(@"placeholderTextViewShouldBeginEditing");    return YES;}- (BOOL)placeholderTextViewShouldEndEditing:(PlaceholderTextView *)textView {        NSLog(@"placeholderTextViewShouldEndEditing");    return YES;}- (void)placeholderTextViewDidBeginEditing:(PlaceholderTextView *)textView {        NSLog(@"placeholderTextViewDidBeginEditing");}- (void)placeholderTextViewDidEndEditing:(PlaceholderTextView *)textView {        NSLog(@"placeholderTextViewDidEndEditing");}#pragma mark - System method.- (void)viewDidAppear:(BOOL)animated {    [super viewDidAppear:animated];    [_textView placeholderTextViewbecomeFirstResponder];}@end