在iOS中动态自动扩展UITextView高度

Question

I have a simple textView who's data gets populated dynamically. I want to resize the height of the textview once the data is populated so that I don't see a vertical scroll nor the text gets clipped.i want to do this task programatically. I have a label which should be placed 20 px below height of textview like "interested".

This is my code:

lblHobbies = [[UILabel alloc]initWithFrame:CGRectMake(10, 310, 300, 20)];
lblHobbies.text=@"Hobbies";
lblHobbies.font=[UIFont systemFontOfSize:16.0];
lblHobbies.textColor=[UIColor colorWithRed:153.0f/255.0f green:153.0f/255.0f blue:153.0f/255.0f alpha:1];

[scrollView addSubview:lblHobbies];

tViewhobbies=[[UITextView alloc]initWithFrame:CGRectMake(10, 330, 300, 60)];
tViewhobbies.backgroundColor=[UIColor clearColor];
tViewhobbies.layer.cornerRadius=5;
[tViewhobbies setFont:[UIFont systemFontOfSize:13.0]];
[tViewhobbies setUserInteractionEnabled:NO];

tViewhobbies.font=[UIFont systemFontOfSize:16.0];
tViewhobbies.backgroundColor=[UIColor colorWithRed:0.662745 green:0.662745 blue:0.662745 alpha:0.5];

tViewhobbies.delegate=self;

tViewhobbies.scrollEnabled=YES;

[scrollView addSubview:tViewhobbies];

lblInterests = [[UILabel alloc]initWithFrame:CGRectMake(10, 370, 300, 20)];            
lblInterests.text=@"Interests";
lblInterests.font=[UIFont systemFontOfSize:16.0];
lblInterests.textColor=[UIColor colorWithRed:153.0f/255.0f green:153.0f/255.0f blue:153.0f/255.0f alpha:1];

[scrollView addSubview:lblInterests];


tViewInterests=[[UITextView alloc]initWithFrame:CGRectMake(10, 390, 300, 60)];
tViewInterests.backgroundColor=[UIColor clearColor];
[tViewInterests setFont:[UIFont systemFontOfSize:13.0]];
[tViewInterests setUserInteractionEnabled:NO];
tViewInterests.font=[UIFont systemFontOfSize:16.0];      
tViewInterests.backgroundColor=[UIColor colorWithRed:0.662745 green:0.662745 blue:0.662745 alpha:0.5];

tViewInterests.delegate=self;

tViewInterests.scrollEnabled=YES;

[scrollView addSubview:tViewInterests];

Answer 1

您可以通过UITextview的sizeToFit方法进行尝试。

[myTextView sizeToFit];

Answer 2

This depends on font size. Following code retrieve the font size of text and return the height and width required. This may help you to create the logic:

NSDictionary *attribs1 = @{
                          NSFontAttributeName: tViewhobbies.font
                          };

CGSize textViewSize = [tViewhobbies.text sizeWithAttributes:attribs1];

Answer 3

Below is the trick I always use...

1. Create one fake UITextView
2. Put data into it
3. Call sizeToFit
4. Hide this textview
5. Set actual textview height based on this fake uitextview...

Done....

Answer 4

You can do something like:

tViewhobbies=[[UITextView alloc]init];
    tViewhobbies.backgroundColor=[UIColor clearColor];
    [tViewhobbies setText:@"Lorem ipsum dolor sit er elit lamet, consectetaur cillium adipisicing pecu, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat."];
    CGSize maxSize = CGSizeMake(300.0f, CGFLOAT_MAX);
    CGSize requiredSize = [tViewhobbies sizeThatFits:maxSize];
    tViewhobbies.frame = CGRectMake(10,330, requiredSize.width, requiredSize.height);
    tViewhobbies.layer.cornerRadius=5;
    [tViewhobbies setUserInteractionEnabled:NO];
    tViewhobbies.font=[UIFont systemFontOfSize:16.0];
    tViewhobbies.backgroundColor=[UIColor colorWithRed:0.662745 green:0.662745 blue:0.662745 alpha:0.5];
    tViewhobbies.delegate=self;
    tViewhobbies.scrollEnabled=NO;
    [scrollView addSubview:tViewhobbies];
    [tViewhobbies sizeToFit];

First you have to assign the text before setting its frame for calculating its frame and than you can do sizeToFit . I am sure it'll work. And all below labels or textviews' y position should be relative to that textview.