所以我已经写好了
.m
import "CustomTextView.h"
#import "UIView+Extension.h" // 这个是UIView的setget方法设置xywh属性的 相信大家项目里都有这样一个分类
#define DefaultColor [UIColor grayColor]
@interface JXCustomTextView ()
@property (nonatomic, strong) UILabel * placeHolderLabel;
@property (nonatomic, assign) UIEdgeInsets placeHolderLabelInsets;
@end
@implementation JXCustomTextView
- (void)dealloc{
[[NSNotificationCenter defaultCenter]removeObserver:self name:UITextViewTextDidChangeNotification object:nil];
[[NSNotificationCenter defaultCenter]removeObserver:self name:UITextViewTextDidEndEditingNotification object:nil];
}
- (instancetype)initWithCoder:(NSCoder*)aDecoder{
if(self= [superinitWithCoder:aDecoder]) {
[selfsetUpView];
}
return self;
}
- (instancetype)initWithFrame:(CGRect)frame{
if(self= [superinitWithFrame:frame]) {
[selfsetUpView];
}
return self;
}
#pragma mark---setter
- (void)setTextContainerInset:(UIEdgeInsets)textContainerInset{
//调整text内容边距
[supersetTextContainerInset:textContainerInset];
self.placeHolderLabelInsets=UIEdgeInsetsMake(textContainerInset.top, textContainerInset.left+2, textContainerInset.bottom, textContainerInset.right+2);
[self setNeedsLayout];
}
- (void)setText:(NSString*)text{
[supersetText:text];
[self textViewDidChange:nil];
}
- (void)setFont:(UIFont*)font{
[supersetFont:font];
self.placeHolderLabel.font = font;
}
- (void)setPlaceholder:(NSString*)placeholder{
_placeholder= placeholder;
self.placeHolderLabel.text = _placeholder;
}
- (void)setPlaceholderColor:(UIColor*)placeholderColor{
_placeholderColor= placeholderColor;
self.placeHolderLabel.textColor = _placeholderColor;
}
- (void)setIsAutoHeight:(BOOL)isAutoHeight{
_isAutoHeight= isAutoHeight;
if (_isAutoHeight) {
self.scrollEnabled=NO;
}
}
- (void)setPlaceHolderLabelInsets:(UIEdgeInsets)placeHolderLabelInsets{
_placeHolderLabelInsets= placeHolderLabelInsets;
[self layoutSubviews];
}
- (void)resetPlaceHolderLabelState{
if([selfhasText]) {
self.placeHolderLabel.hidden = YES;
}else{
self.placeHolderLabel.hidden = NO;
}
}
#pragma mark---UI
- (void)setUpView{
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(textViewDidEndEditing:) name:UITextViewTextDidEndEditingNotification object:nil];
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(textViewDidChange:) name:UITextViewTextDidChangeNotification object:nil];
_placeHolderLabel = [UILabel new];
_placeHolderLabel.textColor = self.placeholderColor ? self.placeholderColor : DefaultColor;
_placeHolderLabel.text = self.placeholder;
_placeHolderLabel.font = self.font;
_placeHolderLabel.numberOfLines = 0;
[self addSubview:_placeHolderLabel];
[self setPlaceHolderLabelInsets:UIEdgeInsetsMake(8, 2, 8, 2)];
self.font = [UIFont systemFontOfSize:17];
self.isAutoHeight = YES;
self.maxHeight=300;
self.minHeight=30;
}
- (void)layoutSubviews{
[super layoutSubviews];
_placeHolderLabel.frame = CGRectMake(_placeHolderLabelInsets.left, _placeHolderLabelInsets.top, self.frame.size.width - _placeHolderLabelInsets.left - _placeHolderLabelInsets.right, 0);
[_placeHolderLabel sizeToFit];
if (_placeHolderLabel.hidden == NO && self.isAutoHeight) {
CGFloat placeHolderHeight = _placeHolderLabel.height + (_placeHolderLabelInsets.top + _placeHolderLabelInsets.bottom);
if(placeHolderHeight >self.height) {
self.height= placeHolderHeight;
}
}
}
#pragma mark ---NSNotificationEvent
- (void)textViewDidEndEditing:(NSNotification*)notification{
}
- (void)textViewDidChange:(NSNotification*)notification{
if(self.text.length==0) {
self.placeHolderLabel.text = _placeholder;
self.placeHolderLabel.hidden = NO;
[self setNeedsLayout];
}else{
self.placeHolderLabel.hidden = YES;
}
if(self.markedTextRange == nil){
//没有候选字符
[self st_setAttributedString];
self.textDidChangedBlock ? self.textDidChangedBlock(self.text) : nil;
};
[self st_autoHeight];
[self resetPlaceHolderLabelState];
}
#pragma mark--- function
//设置属性字符串
- (void)st_setAttributedString{
//设置了间距
if (self.verticalSpacing > 0) {
if(self.text.length>0) {
NSRangerange =self.selectedRange;
self.attributedText= [[NSAttributedStringalloc]initWithString:self.textattributes:[selfattrs]];
self.selectedRange= range;
}
}
}
- (NSDictionary *)attrs{
if (self.verticalSpacing > 0) {
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.lineSpacing=self.verticalSpacing;// 字体的行间距
NSDictionary *attributes = @{NSFontAttributeName:self.font,NSParagraphStyleAttributeName:paragraphStyle};
returnattributes;
}
return nil;
}
- (void)st_autoHeight{
//是否开启
CGFloatheight =0;;
if (self.isAutoHeight) {
if(self.text.length==0){
height =self.minHeight;
self.height=self.minHeight;
//高度变化
self.textViewAutoHeight ? self.textViewAutoHeight(self.height) : nil;
}else{
height = [selfatt_height];
if(height !=self.height) {
if(height >self.maxHeight) {
self.height=self.maxHeight;
self.scrollEnabled=YES;
}elseif(height <self.minHeight){
self.height=self.minHeight;
self.scrollEnabled=NO;
}else{
self.scrollEnabled=NO;
self.height= height;
}
//高度变化
self.textViewAutoHeight ? self.textViewAutoHeight(self.height) : nil;
}
}
}
}
//计算高度
- (CGFloat)att_height{
@autoreleasepool{
UITextView* tempTV = [UITextViewnew];
tempTV.font=self.font;
tempTV.textContainerInset = self.textContainerInset;
if([selfattrs]) {
tempTV.attributedText= [[NSAttributedStringalloc]initWithString:self.textattributes:[selfattrs]];
}else{
tempTV.text=self.text;
}
CGFloatheight = [tempTVsizeThatFits:CGSizeMake(self.width,MAXFLOAT)].height;
returnheight;
}
}
@end
.h
@interface CustomTextView : UITextView
/** 占位文字 */
@property (nonatomic, copy) NSString *placeholder;
/** 占位文字颜色 */
@property (nonatomic, strong) UIColor *placeholderColor;
/** 行间距 */
@property (nonatomic, assign) CGFloat verticalSpacing;
/**设置最大高度*/
@property (nonatomic, assign) CGFloat maxHeight;
/**设置最小高度*/
@property (nonatomic, assign) CGFloat minHeight;
/**是不是自适应高度，默认为YES*/
@property (nonatomic, assign) BOOL isAutoHeight;
@property (nonatomic, copy) void(^textDidChangedBlock)(NSString * text);
@property (nonatomic, copy) void (^textViewAutoHeight)(CGFloat textHeight);
@end
/// 用法
- (CustomTextView *)themeTextView {
if (!_themeTextView) {
_themeTextView= [[CustomTextView alloc] init];
_themeTextView.placeholder = @"添加日程、会议、活动主题";
_themeTextView.font = [UIFont boldSystemFontOfSize:16];
_themeTextView.verticalSpacing = 2;
_themeTextView.textContainerInset=UIEdgeInsetsMake(15,10,15,10);
_themeTextView.maxHeight = 80; // TextView会自动撑开，设置最大高度就会撑到这个高度就不会再撑开了，就会向上滚动
_themeTextView.minHeight = 80; // 最小高度 也就是默认高度
_themeTextView.backgroundColor= [UIColor whiteColor];
_themeTextView.text = @"";
_themeTextView.textViewAutoHeight = ^(CGFloat height){
};
}
return _themeTextView;
}
goodBay
