UITextField与UItextView
UITextField:不能换行
UITextView:没有提示文字，placeHolder
解决办法：
在UITextview中设置一个label，封装起来
// Created by 殷婷婷 on 15-5-31.
// Copyright (c) 2015年 lanou. All rights reserved.
//textView封装
#import "SendStatusView.h"
@implementation SendStatusView
- (instancetype)initWithFrame:(CGRect)frame{
if (self = [super initWithFrame:frame]) {
[self setUpSubviews];
}
return self;
}
//添加子控件
- (void)setUpSubviews{
UILabel *label = [[UILabel alloc]init];
label.textColor = [UIColor grayColor];
//label.font = [UIFont systemFontOfSize:12.0];
label.numberOfLines = 0;
[self addSubview:label];
self.placeholderLabel = label;
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(textChange) name:UITextViewTextDidChangeNotification object:self];
}
- (void)dealloc{
[[NSNotificationCenter defaultCenter]removeObserver:self];
}
- (void)textChange{
self.placeholderLabel.hidden = self.text.length;
}
- (void)setPlaceHolder:(NSString *)placeHolder{
if(placeHolder.length){
CGSize maxSize = CGSizeMake(self.bounds.size.width - 10, MAXFLOAT);
CGSize realSize = [placeHolder boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:self.font} context:nil].size;
CGFloat labelX = 5;
CGFloat labelY = 7;
self.placeholderLabel.frame = CGRectMake(labelX, labelY, realSize.width, realSize.height);
self.placeholderLabel.text = placeHolder;
}
}
-(void)setFont:(UIFont *)font{
[super setFont:font];
self.placeholderLabel.font = font;
}
@end