//
//  CustomTextView.m
//  HD wallpaper
//


#import "CustomTextView.h"

@interface CustomTextView ()

@property (nonatomic, strong) UILabel *placeholderLabel;

@end

@implementation CustomTextView

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        [self commonInit];
    }
    return self;
}

- (void)awakeFromNib {
    [super awakeFromNib];
    [self commonInit];
}

- (void)commonInit {
    _placeholderColor = [UIColor lightGrayColor];
    _borderColor = [UIColor grayColor];
    _borderWidth = 1.0;
    _cornerRadius = 5.0;
    
    self.layer.borderColor = self.borderColor.CGColor;
    self.layer.borderWidth = self.borderWidth;
    self.layer.cornerRadius = self.cornerRadius;
    
    self.placeholderLabel = [[UILabel alloc] initWithFrame:CGRectZero];
    self.placeholderLabel.textColor = self.placeholderColor;
    self.placeholderLabel.numberOfLines = 0;
    [self addSubview:self.placeholderLabel];
    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textDidChange:) name:UITextViewTextDidChangeNotification object:nil];
}

- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)setPlaceholder:(NSString *)placeholder {
    _placeholder = placeholder;
    self.placeholderLabel.text = placeholder;
    [self setNeedsLayout];
}

- (void)layoutSubviews {
    [super layoutSubviews];
    [self updatePlaceholderFrame];
    self.placeholderLabel.hidden = self.hasText;
}

- (void)updatePlaceholderFrame {
    CGFloat padding = self.textContainer.lineFragmentPadding;
    CGFloat width = CGRectGetWidth(self.bounds) - padding * 2;
    CGSize placeholderSize = [self.placeholderLabel sizeThatFits:CGSizeMake(width, CGFLOAT_MAX)];
    self.placeholderLabel.frame = CGRectMake(padding, self.textContainerInset.top, width, placeholderSize.height);
}

- (void)textDidChange:(NSNotification *)notification {
    self.placeholderLabel.hidden = self.hasText;
}

@end


//#import "CustomTextView.h"
//
//// 创建并添加CustomTextView
//CustomTextView *textView = [[CustomTextView alloc] initWithFrame:CGRectMake(20, 100, self.view.frame.size.width - 40, 150)];
//textView.placeholder = @"请输入内容...";
//textView.placeholderColor = [UIColor lightGrayColor];
//textView.borderColor = [UIColor blueColor];
//textView.borderWidth = 2.0;
//textView.cornerRadius = 10.0;
//[self.view addSubview:textView];