Question

我的应用程序中有许多不同的按钮，但大多数按钮都分配了相同的属性：

login = [[UIButton alloc]initWithFrame:CGRectMake(8, CGRectGetMaxY(password.frame) + 16, loginView.frame.size.width - 16, 40)];
[login setTitle:@"Login" forState:UIControlStateNormal];
[login.titleLabel setFont:[UIFont fontWithName:@"Avenir Next" size:18]];
[login setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
[login setTitleColor:[UIColor colorWithWhite:0.7 alpha:1] forState:UIControlStateHighlighted];
[login setTitleColor:[UIColor colorWithWhite:0.5 alpha:1] forState:UIControlStateDisabled];

有没有办法创建一个已经分配了这些默认属性的类或按钮？所以我可以简单地说：

CustomButtom *btn = [CustomButton alloc]init];

然后btn会分配以上所有属性吗？

感谢。

Answer 1

另一种处理方法是，您可以创建一个私有方法，该方法将返回具有相同属性的UIButton。我认为创建一个UIButton的子类是有点不必要的。

Answer 2

您可以通过创建 CustomButton 类

来完成此操作

Xcode - ＆gt; 新文件 - ＆gt; Cocoa Touch Class - ＆gt; 下一步 - ＆gt;命名你的按钮 - ＆gt;选择 UIButton

的子类

CustomButton.h文件

#import "CustomButton.h"

@implementation CustomButton


// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
// Drawing code
//login = [[UIButton alloc]initWithFrame:CGRectMake(8, CGRectGetMaxY(password.frame) + 16, loginView.frame.size.width - 16, 40)];
[self setTitle:@"Login" forState:UIControlStateNormal];
[self.titleLabel setFont:[UIFont fontWithName:@"Avenir Next" size:18]];
[self setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
[self setTitleColor:[UIColor colorWithWhite:0.7 alpha:1] forState:UIControlStateHighlighted];
[self setTitleColor:[UIColor colorWithWhite:0.5 alpha:1] forState:UIControlStateDisabled];
}

@end

CustomButton.m文件

CustomButton *customButton = [[CustomButton alloc]initWithFrame:CGRectMake(8, CGRectGetMaxY(password.frame) + 16, loginView.frame.size.width - 16, 40)];
[customButton addTarget:self action:@selector(loginButtonPressed:) forControlEvents:UIControlEventTouchDown];
[YourView addSubview:customButton];

现在，给你打电话

tempInit = input()
temp = float(tempInit[:-1])
if tempInit[-1]== 'F':
    c=(temp-32)*5/9
    print(str(c)+'C')
if tempInit[-1]== 'C':
    f =(temp*9/5)+32
    print(str(f)+'F')

Answer 3

您有两种选择：

制作一个可以传递UIButton的功能，为您设置属性
为UIButton编写一个与上述相同的类别。类别允许您在没有子类化的情况下向类添加功能。请参阅https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/ProgrammingWithObjectiveC/CustomizingExistingClasses/CustomizingExistingClasses.html

Answer 4

是。您可以继承UIButton。当您覆盖init方法设置属性时，您可以获得具有相同属性的按钮。

如何重用属性

4 个答案: