UITextView占位文字（placeHolder）
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- (void)viewDidLoad {
[super viewDidLoad];
self.contentTV = [[UITextView alloc] initWithFrame:CGRectMake(20, 100, APPSCREEN_WIDTH - 40, 100)];
self.contentTV.layer.borderWidth = 0.5;
self.contentTV.delegate = self;
self.contentTV.attributedText = [self stringTurnToAttstrWithString:@" *我要留言:"];
self.contentTV.font = [UIFont systemFontOfSize:15];
self.contentTV.layer.borderColor = [UIColor lightGrayColor].CGColor;
[self.view addSubview:self.contentTV];
}
- (NSMutableAttributedString *)stringTurnToAttstrWithString:(NSString *)string{
NSMutableAttributedString * attStr = [[NSMutableAttributedString alloc] initWithString:string];
//颜色
[attStr addAttribute:NSForegroundColorAttributeName
value:[UIColor redColor]
range:NSMakeRange(3, 1)];
[attStr addAttribute:NSForegroundColorAttributeName
value:RGBCOLORV(0xaaaaaa)
range:NSMakeRange(4, string.length - 4)];
//字体大小
[attStr addAttribute:NSFontAttributeName
value:[UIFont systemFontOfSize:15]
range:NSMakeRange(0, attStr.length)];
return attStr;
}
- (void)textViewDidBeginEditing:(UITextView *)textView{
if ([textView.text isEqualToString:@" *我要留言:"]) {
textView.attributedText = [[NSMutableAttributedString alloc] initWithString:@""];
}
textView.textColor = RGBCOLORV(0x000000);
}
- (void)textViewDidEndEditing:(UITextView *)textView{
if (textView.attributedText.length == 0) {
textView.attributedText = [self stringTurnToAttstrWithString:@" *我要留言:"];
}
}
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
UITouch *tc = [touches anyObject];
if ([self.contentTV isFirstResponder] && tc.view != self.contentTV) {
[self.contentTV resignFirstResponder];
}
}
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