Objective c 迭代对象操作或同时更改多个对象
做我正在做的事情的最好方式是什么Objective c 迭代对象操作或同时更改多个对象,objective-c,iphone,Objective C,Iphone,做我正在做的事情的最好方式是什么goodThingX、badThingX和nothin是UILabel NSString *todayNothing = [[todayArray objectAtIndex:0] objectForKey: @"nothing"]; if (todayNothing!=NULL) { goodThing1.hidden = YES; goodThing2.hidden = YES; goodThing3.hidden = YES;
goodThingX
、badThingX
和nothin
是UILabel
NSString *todayNothing = [[todayArray objectAtIndex:0] objectForKey: @"nothing"];
if (todayNothing!=NULL) {
goodThing1.hidden = YES;
goodThing2.hidden = YES;
goodThing3.hidden = YES;
badThing1.hidden = YES;
badThing2.hidden = YES;
badThing3.hidden = YES;
nothing.text = todayNothing;
nothing.hidden = NO;
} else {
goodThing1.hidden = NO;
goodThing2.hidden = NO;
goodThing3.hidden = NO;
badThing1.hidden = NO;
badThing2.hidden = NO;
badThing3.hidden = NO;
nothing.hidden = YES;
}
i、 e.
todayNothing
有文本时,我想隐藏6个标签,并显示nothing
标签,否则相反。我不会费心去优化它,但现在可能会有比6更多的标签。您可以将它们全部放在init
或awakeFromNib
或类似位置的数组中,以便以后更容易地迭代
@class MyThing {
UIView *theThings[NUM_THINGS]; // ...or use an NSArray if you like that
}
@end
- (id)init // maybe awakeFromNib would be a better place for UI elements
{
self = [super init];
if (self) {
theThings[0] = goodThing1;
theThings[1] = goodThing2;
theThings[2] = goodThing3;
:
}
return self;
}
…然后再使用这样的循环
for (int i=0; i<NUM_THINGS; i++)
theThings[i].hidden = YES;
对于(inti=0;i首先,您有一个称为“布尔变量”的东西
其次,最好使用数组或NSArray
来存储所有好的
-和坏的
。这会将代码长度减少一半,所以我现在就使用它。与此同时,我正在尝试更改epatel的NSArray代码。我使用的是NSArray,而不是UIView*things[NUM_THINGS];
我在循环中迭代时遇到问题,我正在尝试[THINGS objectAtIndex:1];
我做得对吗?对NSArray使用快速枚举(用于循环中)
!
NSString *todayNothing = [[todayArray objectAtIndex:0] objectForKey: @"nothing"];
BOOL todayNothing_has_something = (todayNothing!=nil); // YES if todayNothing!=nil, NO otherwise
goodThing1.hidden = todayNothing_has_something;
goodThing2.hidden = todayNothing_has_something;
goodThing3.hidden = todayNothing_has_something;
badThing1.hidden = todayNothing_has_something;
badThing2.hidden = todayNothing_has_something;
badThing3.hidden = todayNothing_has_something;
if (todayNothing)
nothing.text = todayNothing;
nothing.hidden = ! todayNothing_has_something;