Initial commit

2017-08-15 16:59:01 +08:00
commit bdc83e07ef
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+//
+//  UMComBriefEditView.m
+//  UMCommunity
+//
+//  Created by 张军华 on 16/5/17.
+//  Copyright © 2016年 Umeng. All rights reserved.
+//
+
+#import "UMComBriefEditView.h"
+
+@interface UMComBriefEditView ()
+
+@property (nonatomic,weak) UILabel *placeholderLabel; //这里先拿出这个label以方便我们后面的使用
+
+@end
+
+@implementation UMComBriefEditView
+
+- (instancetype)initWithFrame:(CGRect)frame
+{
+    self = [super initWithFrame:frame];
+    if(self) {
+        //self.backgroundColor= [UIColor clearColor];
+        UILabel *placeholderLabel = [[UILabel alloc]init];//添加一个占位label
+        placeholderLabel.backgroundColor= [UIColor clearColor];
+        
+        //只设置一行
+        placeholderLabel.numberOfLines=1; //设置可以输入多行文字时可以自动换行
+        [self addSubview:placeholderLabel];
+        self.placeholderLabel= placeholderLabel; //赋值保存
+        self.placeholderLabel.frame = CGRectMake(5, 0, frame.size.width, 30);
+        
+        self.placeholderLabel.textColor= [UIColor lightGrayColor]; //设置占位文字默认颜色
+        self.placeholderLabel.font = [UIFont systemFontOfSize:14]; //设置默认的字体
+        
+        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textDidChange) name:UITextViewTextDidChangeNotification object:self]; //通知:监听文字的改变
+    }
+    return self;
+}
+
+#pragma mark -监听文字改变
+
+- (void)textDidChange {
+    
+    if (self.text.length > 0) {
+        self.placeholderLabel.hidden = YES;
+    }
+    else
+    {
+        self.placeholderLabel.hidden = NO;
+    }
+    
+    //self.hasText频繁调用会崩溃(原因还没有查到!!!)
+    //self.placeholderLabel.hidden = self.hasText;
+    
+}
+
+//- (void)setText:(NSString*)text{
+//    [super setText:text];
+//    [self textDidChange]; //这里调用的就是 UITextViewTextDidChangeNotification 通知的回调
+//    
+//}
+
+
+- (void)dealloc{
+    
+    [[NSNotificationCenter defaultCenter]removeObserver:UITextViewTextDidChangeNotification];
+    
+}
+
+
+#pragma mark - 设置属性
+
+-(void)setPlaceholder:(NSString *)placeholder
+{
+    _placeholder= [placeholder copy];
+    self.placeholderLabel.text = placeholder;
+}
+
+-(void) setPlaceholderColor:(UIColor *)placeholderColor
+{
+    _placeholderColor = placeholderColor;
+    
+    self.placeholderLabel.textColor= placeholderColor;
+}
+
+-(void) setPlaceholderFont:(UIFont *)placeholderFont
+{
+    _placeholderFont = placeholderFont;
+    
+    self.placeholderLabel.font = placeholderFont;
+}
+
+@end