獲取UILabel上最後一個字符串的位置。獲取文字長度和高度，自動換行

 1 //行的高度。
 2 -(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
 3    NewNotificationCell *cell = (NewNotificationCell *)[self tableView:tableView cellForRowAtIndexPath:indexPath];
 4     cell.myLabel.text = [self.dataArray objectAtIndex:indexPath.row];
 5     labelSize = [cell.myLabel.text sizeWithFont:[UIFont fontWithName:@"Arial" size:15] constrainedToSize:CGSizeMake(cell.myLabel.frame.size.width, 1000) lineBreakMode:UILineBreakModeWordWrap];
 6     cell.myLabel.lineBreakMode = UILineBreakModeWordWrap;
 7     cell.myLabel.numberOfLines = 0;
 8     [cell.myLabel setFont:[UIFont fontWithName:@"Arial" size:15]];
 9     cell.myLabel.frame = CGRectMake(0, 0, labelSize.width, labelSize.height);
10 
11     return labelSize.height+30;
12 }

 1     //自動換行。
 2     cell.myLabel.text = [self.dataArray objectAtIndex:indexPath.row];
 3     labelSize = [cell.myLabel.text sizeWithFont:[UIFont fontWithName:@"Arial" size:15] constrainedToSize:CGSizeMake(cell.myLabel.frame.size.width, 1000) lineBreakMode:UILineBreakModeWordWrap];
 4     cell.myLabel.lineBreakMode = UILineBreakModeWordWrap;
 5     cell.myLabel.numberOfLines = 0;
 6     [cell.myLabel setFont:[UIFont fontWithName:@"Arial" size:15]];
 7     cell.myLabel.frame = CGRectMake(0, 0, labelSize.width, labelSize.height);
 8 
 9     //獲取文字長度和高度。
10     CGSize fontSize =[cell.myLabel.text sizeWithFont:cell.myLabel.font
11                                     forWidth:cell.myLabel.frame.size.width
12                                lineBreakMode:UILineBreakModeWordWrap];
13     NSLog(@"文字長度=%f",fontSize.width);
14 
15     //獲取UILabel上最後一個字符串的位置。
16     CGPoint lastPoint;
17     CGSize sz = [cell.myLabel.text sizeWithFont:cell.myLabel.font constrainedToSize:CGSizeMake(MAXFLOAT, 40)];
18 
19     CGSize linesSz = [cell.myLabel.text sizeWithFont:cell.myLabel.font constrainedToSize:CGSizeMake(cell.myLabel.frame.size.width, MAXFLOAT) lineBreakMode:UILineBreakModeWordWrap];
20     if(sz.width <= linesSz.width) //判斷是否折行
21     {
22         lastPoint = CGPointMake(cell.myLabel.frame.origin.x + sz.width, cell.myLabel.frame.origin.y);
23     }
24     else
25     {
26         lastPoint = CGPointMake(cell.myLabel.frame.origin.x + (int)sz.width % (int)linesSz.width,linesSz.height - sz.height);
27     }
28     NSLog(@"====%f",lastPoint.x);
29 
30 
31     [cell.myButton setTitle:@"查看" forState:UIControlStateNormal];
32     [cell.myButton setBackgroundImage:[UIImage imageNamed:@"button.png"] forState:UIControlStateNormal];
33     if ([cell.myButton.titleLabel.text isEqualToString:@"查看"]) {
34         cell.myButton.frame = CGRectMake(lastPoint.x+5, labelSize.height-19, 30, 20);
35     }
36     [cell.timeButton setTitle:@"今天" forState:UIControlStateNormal];
37     cell.timeButton.frame = CGRectMake(260, labelSize.height+8, 50, 20);
38     return cell;
39 }