标签Objective-C中的SetLeftView

Question

it has been asked before (using textfield, and I'm asking how to include a character not a small icon), and yes I have already tried using this SetLeftView to put a dollar sign '$' or whatever character I want beside the TEXTFIELD.

However, I do not want a textfield, but a label, and when I apply the same code to do what I want, it returns me an error, I mean Xcode fails to build the code.

Here is my code:

 // We add a label to the top that will display the results
self.resultLabel = [[UILabel alloc] initWithFrame:CGRectMake(25, 80, TEXTAREA_WIDTH, TEXTAREA_HEIGHT)];
[resultLabel setBackgroundColor:[UIColor clearColor]];
[resultLabel setText:@"01234"];
[resultLabel setFont:[UIFont fontWithName:@"AppleGothic" size:30.0f]];
resultLabel.textColor = RGB(255,255,255);
resultLabel.textAlignment = NSTextAlignmentCenter;
 // Add it to the view
[self.view addSubview:resultLabel];


UILabel *dollarSignLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 80, 25, 40)];
dollarSignLabel.text = @"$";
dollarSignLabel.textColor = RGB(255,255,255);
[dollarSignLabel setFont:[UIFont fontWithName:@"AppleGothic" size:30.0f]];
[resultLabel setLeftView:dollarSignLabel];
[resultLabel setLeftViewMode:UITextFieldViewModeAlways];

Error: No visible @interface for 'UILabel' declares the selector 'setLeftView'. Same error in the line of setLeftViewMode.

Again, this works if I use a textfield.

My working code (using textfield)

// adding a textField for input
UITextField *myTextField = [[UITextField alloc] initWithFrame:CGRectMake(viewHalf-30, 100, 200, 40)];
[myTextField setBackgroundColor:[UIColor clearColor]];
[myTextField setText:@"0"];
[myTextField setFont:[UIFont fontWithName:@"AppleGothic" size:30.0f]];
myTextField.textColor = RGB(255,255,255);
[[self view] addSubview:myTextField];

UILabel *dollarSignLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 25, 40)];
dollarSignLabel.text = @"$";
dollarSignLabel.textColor = RGB(255,255,255);
[dollarSignLabel setFont:[UIFont fontWithName:@"AppleGothic" size:30.0f]];
[myTextField setLeftView:dollarSignLabel];
[myTextField setLeftViewMode:UITextFieldViewModeAlways];

Answer 1

The reason you can't apply that because UILabel doesn't have a method named setLeftView as UITextField do.

What you can do is :

1. Create two labels next to each other.
2. Set left labels trailingSpace to right label to 0. Arrange other constraints whatever you want.
3. Set left label's textAlingment property to NSTextAlignmentRight and right label's to NSTextAlignmentLeft.
4. Set dolar sign on a left label and numbers to another.

Answer 2

hope this will help u out.

1. add a dollar image on your label.

2. override following method of UILabel

    -(CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOfLines:(NSInteger)numberOfLines { bounds.origin.x =+leftMargin; return bounds; } - (void)drawTextInRect:(CGRect)rect { [super drawTextInRect: CGRectInset(self.bounds, leftMargin , 0)]; } 

Answer 3

Since a label isn't editable by the user anyway, there is no reason not just to add your $ sign to the label itself.

label.text = [@"$" stringByAppedingString:yourText];

---

if the special symbol should be an image instead, then look at NSTextAttachment & draw attributed Text