错误：'setText 的参数 1 的类型不兼容：

Question

你好，我正在为我的手机在 Objective C 中编写一个温度转换器程序，我的代码如下，我收到错误“”错误：'setText 的参数 1 的类型不兼容：“”请有人帮助我解决我的问题

1. interface section

#import <UIKit/UIKit.h>

@interface farh_celcius_conv_AppDelegate : NSObject <UIApplicationDelegate> {
    UIWindow *window;
    UILabel *display;
    IBOutlet UITextField *farhenite;
    IBOutlet UIButton *convert;
    float n ;
    float k;
}

-(IBAction) convert; 


@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet UILabel *display;
@property (nonatomic, retain) IBOutlet UITextField *farhenite;
@property (nonatomic, retain) IBOutlet UIButton *convert;
@end

2. implementation section
#import "farh_celcius_conv_AppDelegate.h"

@implementation farh_celcius_conv_AppDelegate

@synthesize window,display,farhenite;

-(IBAction) convert {

    NSString *str = [NSString txt];

    float n = [str floatValue];

    k = (n - 32)*(5/9);

        [display setText: k]; 

   // error:incompatible type for argument 1 of 'setText:

}

- (void)applicationDidFinishLaunching:(UIApplication *)application {    

    // Override point for customization after application launch
    [window makeKeyAndVisible];
}


- (void)dealloc {
    [window release];
    [super dealloc];
}


@end

Answer 1

你可以尝试

 display.text = [NSString stringWithFormat:@"%f",k];

也改变这条线吗

NSString *str = youStr  //rather than [NSString txt].

Answer 2

试试这个，

因为 k 不是 NSString。

-(IBAction) convert {

    NSString *str = [NSString stringWithFormat:@"%@", farhenite.text];

    float n = [str floatValue];

    k = (n - 32)*(5/9);

        //[display setText: k]; 
   display.text = [NSString stringWithFormat:@"%f", k];

   // error:incompatible type for argument 1 of 'setText:

}

Answer 3

'k' 不是 NSString。试试这个

[display setText:[NSString stringWithFormat:@"%f",k]];

Answer 4

[self.display setText:[NSString stringWithFormat:@"%f",k]];